It all started when we were on vacation in Miami. Shira and I were staying at a hotel by the beach while we visited her father. It had been a year since my mother-in-law passed away, and we wanted to keep my father-in-law some company.

"Any luck?" My wife asked as she frantically got dressed.

I had been swiping on a swingers app, looking for someone to hook up with while we were away. Shira and I had been curious about bringing someone else into bed with us for a couple of years now, and we thought our vacation would be the perfect time to give it a try.

"Nah. There are some cute couples, but most of the single guys are duds," I told her.

"Well, keep looking. I plan on taking on two cocks while we're down here!" Shira giggled.

Not wanting to disappoint my wife, I kept swiping. However, with one swipe, our whole world changed. There was my father-in-law's photo. I immediately clicked on his profile, curious about what he was looking for.

"Looking to meet a younger couple who'd be into an older guy. I'm very open," the profile read.

I ran my fingers over the screen, flipping through his pics. When his last picture popped up, I nearly dropped my phone. There was his cock, fully erect, dripping with pre-cum. I couldn't believe what I was seeing. His cock was thick and looked like it was about to burst. I had so many questions.

"Whoa! Whose gorgeous cock is that?" Shira asked, leaning into me.

"I'm not sure you want to know," I laughed.

"His face that bad?" she pushed back.

"Not exactly," I demurred.

"Then let me see," my wife said, while grabbing the phone from my hands.

I watched with horror as my wife swiped through the profile. I tried reading her face, but she was giving me nothing. She just kept flicking between the main picture of her father's face and the close-up of his throbbing hard-on. The longer I watched Shira stare at the screen, the more I recognized the look in her eyes. I wanted to call it out, but feared what would happen. Instead, I waited.

Before I could say anything, Shira dropped to her knees, placed the phone on the armrest next to me, and yanked out my throbbing dick. I held my breath as Shira slowly drew her lips over my cock.

"Fuck," I groaned.

Shira twirled her tongue around my length as she bobbed her head up and down. Shockingly, she kept touching my phone, ensuring it never locked. Shira wanted the picture of her father's cock there for her to see as she pleasured me.

There was my wife, dressed in her sleek black sundress, taking inch after inch of my throbbing manhood down her throat, eyeing a picture of her father. I slipped my fingers into her hair and gently thrust my hips forward. Seeing the lust in my wife's gaze was too much for me. Everything about this was wrong, but the taboo nature made us both hotter than we had ever been.

"I'm going to cum. Don't stop looking at Daddy's cock. Imagine it's his cum dripping down your throat," I called out as streams of my cream coated Shira's throat.

A look of satisfaction was plastered across Shira's face. She took her time wiping away the oozing cum off her lips before standing up and straightening herself out.

"Zip yourself up. We are going to be late. You know how Dad hates waiting," she said.

The Uber ride to the house was quiet, neither of us wanting to discuss what had just happened, especially since we were only minutes away from spending the day with her father. 

"Shira!" Geoff hollered.

"Hi, Dad," she quietly responded.

"Hi, Dad," Geoff mocked her. "Give me a hug!" he continued.

Geoff grabbed his daughter, pulling her into his embrace. Reluctantly, Shira hugged her father back.

"What's this? This is how you embrace your father after not seeing him for six months? Give me a real hug," he exclaimed.

Shira glanced over at me. I could see the unease pour out of her. Yet, as her father wrapped his arms around her once more, something in my wife changed. Shira ran her arms over her father's well-defined biceps, taking in his manly physique, before gripping his back tightly. Time stood still as the two of them held each other, reacquainting themselves. It wasn't long before Shira's unease returned.

Sensing her need to escape, I intervened.

"Hey, Geoff. It's great to see you," I said, reaching my hand out.

"Same. You know it's beautiful out. How about we move this conversation over to the pool?" Geoff suggested.

Shira beamed with enthusiasm. While she knew we would spend time by the pool, the realization that her father would get to see her in her bikini suddenly excited her in a way it never had.

The moment we stepped outside, Shira stripped off her sundress and let it drop to the floor. Geoff's eyes widened, shocked by his daughter's sudden near nakedness. I was about to step in and make a joke to alleviate the growing tension, yet something told me to hold back.

Shira shot her father and me a devilish grin before diving into the clear blue water. My throat tightened as I held my breath, desperately waiting for my wife to return to the surface. I couldn't wait to see the water drip down her well-defined chest, as her slicked back hair plastered to her shoulders. The longer I fantasized about my wife's reemergence, the more my cock grew uncomfortably hard in my trunks. Looking over at Geoff, it was clear he was anticipating Shira's return just as much as I was. This old man truly was a horn dog.

Neither of us was disappointed when Shira popped out of the water. She pushed herself up against the concrete ground, the water careening off her slick skin, as she inched her way back to land. If it wasn't for Geoff's obvious erection, I would have been ashamed of the tent that had grown in my swimsuit.

"Sorry that water just screamed out to me. I couldn't help myself," my wife slyly joked.

Shira glared at me. Her eyes screamed things no daughter had the right to say out loud. It was clear that seeing her father's dick pic had more of an effect on her than she was willing to admit.

"Ugh, no worries. I think I'm going to follow suit," Geoff uncomfortably said, while trying to hide his bulge.

With an oversized splash, Geoff jumped into the water, disappearing out of earshot. Shira burst out with laughter, unable to control herself. She couldn't believe the impact she was having on her father.

"What's so funny?" Geoff asked as he swam over to the pool steps.

"Oh, nothing. Mind if I join you? I'm getting cold standing around all wet," Shira asked.

"Come on over. You too, Justin," Geoff said.

Shira walked ahead of me, shaking her ass with every step. She knew she had my attention and was enjoying feeling my eyes piercing her exposed ass. Geoff seemed just as enthralled as I was. He was watching her in a way that surprised us both. Shira was getting the male attention she craved; we just never imagined her father would be one of the guys giving it to her.

Shira settled next to her father. The sexiness of the moment soon faded, replaced by a somberness.

"I miss Mom," Shira stated softly.

"I miss her, too," Geoff replied.

For the next hour, the three of us sat in the water, taking in the sun and sharing stories about my departed mother-in-law.

Then, as the sun shone right above us, Shira's mood seemed to turn on a dime.

"Enough of this. Let's have some fun," my wife exclaimed.

"And what does fun look like?" I laughed.

"Like this!" Shira shouted as she slashed water at her father and me.

Geoff leapt at her, but Shira was too fast. She ran through the shallow water before diving beneath the surface. Geoff followed after her, eager to play her game. The sexually explicit events of this morning faded away, while father and daughter reconnected like old times.

I watched as the two of them swam around the pool like children. Fits of giggles echoed in the fenced off backyard. Eventually, they had had enough. Holding onto the pool wall, Shira and Geoff floated there, savoring their moment of connection. It was a simple second of joy between parent and child, one they had many times throughout their lives.

However, as their bodies drifted closer together, something changed. Geoff wrapped his arm around his daughter's waist, drawing her near. Shira eagerly melted into her father's tight embrace. Her bikini-covered tits smashed against his hairy chest as they chatted. I couldn't make out what they were saying, but the smiles on their faces spoke volumes.

I leaned back and let the scene wash over me. Minutes later, I noticed a shift in Geoff's body language. His hand had slithered down, gripping his daughter's thong-exposed ass. I couldn't believe he would touch his daughter that way. Perhaps they both were so lost in their conversation that it was a mistake, I told myself. But the longer his hand lingered there, the more I accepted that this horny old man was copping a feel.

My lips curled into a smile as my mind raced with dirty fantasies. I pictured Shira bobbing her head up and down her father's length just like she had done to me this morning. She had clearly gotten off seeing the picture of Geoff's dick, making me wonder if she welcomed his touch.

Shira glanced my way, noticing the shit eating grin plastered on my face.

"Don't think we forgot about you," Shira shouted.

"I wouldn't dare imagine such a thing," I yelled back.

Shira and Geoff swam back over to me, joining me by the sun-soaked stairs. We just sat there silently basking in the midday warmth.

Throughout the day, I caught Geoff touching his daughter in totally unnecessary ways. Nothing overt. Just little touches of her thigh, a gentle pat on the small of her back here and there. Not only did Shira not seem to mind, but it was as if she relished his touch. I wanted to say something to her, but I worried that my filthy mind was playing games with me after this morning's excitement.

As the sun began to set, we said our goodbyes and headed back to our hotel.

"That was a lot more fun than I expected," Shira told me as we settled in for the night.

"Well, I doubt you expected your father to cop a feel every chance he could," I thought to myself.

"Geoff seems to be doing a lot better than I thought. He did seem to miss you a lot, though," I voiced.

"Yeah, he did," Shira drifted off, saying.

Her words carried a meaning I wasn't sure she even meant to convey; however, I couldn't help but notice the longing in her voice.

After the long day in the sun, Shira headed to bed early. I grabbed a beer from the minifridge and decided to play around on my phone out on the balcony. The ocean air mixed with the booze was making me slightly lightheaded, something I particularly enjoyed. I pulled off my shirt, letting the warm breeze coat my sweat covered skin. The longer I sat there flipping through my phone, the more I replayed the day in my head.

There was something different about Geoff. Now that his wife was gone, he was embracing a side of himself that I'd never seen before. He seemed free, and even a bit frisky. I guess a year of being alone left him feeling pretty horny.

Images of Dad and Shira playfully splashing each other caused my cock to stir. I discreetly rubbed my hard-on over my shorts as I pulled up the swingers app. I told myself that I was just going to flip through some profiles, but at least a part of me knew my true intent. After ten minutes of swiping, my fingers led me back to Geoff's profile. I flicked through his pics once more, before landing on the image of his raging erection. The longer I stared at the picture, the more I wondered if seeing Shira in her bikini caused his dick to stir like that.

That is when I made the decision that changed all our lives. In a horny daze, I clicked on the message button and sent my father-in-law a note.

"Funny seeing you twice in one day," I wrote.

The instant I sent the message, I immediately regretted it. Nevertheless, it only took a minute for me to get a response. Clearly, a day of playing with his daughter in the pool had left him just as horny as it had left me.

"Well, this is a shock. Please tell me my daughter didn't see this," Dad replied.

"No such luck," I wrote back.

"Before coming today?" He asked.

"Yes," I told him.

Minutes passed as I awaited a response. Clearly, knowing that his daughter had seen his cock shook him. Finally, he responded.

"Well, that explains a lot," he said.

"Oh?" I quickly wrote back, desperate to know more.

"Shira made a comment about feeling my erection in the pool, and said how big it felt. I was shocked by her remark, but now it makes a lot more sense," he explained.

That little minx, I thought to myself. I couldn't believe Shira would say such a thing, but after the way she reacted to seeing her father's dick pic, I guess I shouldn't have been too surprised. I pulled off my shorts and pumped my cock, as I continued chatting with my father-in-law.

"So, seeing Shira in her bikini had an effect on you," I replied.

"How could it not? You're one very lucky guy. She's exactly the type of woman I'm on here searching for," he told me.

"I bet. The way the water trailed down her tits in that little bikini she had on was driving me nuts. I was shocked she wore that in front of you," I wrote.

"Me too, but I wasn't complaining," he said.

"Have you always perved on your daughter?" I pushed.

"Perved lol. I would say I've admired her womanly features. And besides, yes, it is new. There was something different about her energy today," Geoff admitted.

I paused, uncertain how to proceed. Pre-cum had coated my cock, as my fingers glided up and down my shaft. I was feeling good, and this conversation had me on the verge of cumming. If I were in my rational mind, I would have shut this down, but my need to cum left me an aroused mess.

I started to type, uncertain if I would be willing to send what I wrote. I fidgeted with my phone, unable to press send. It was my father-in-law's next message that sent me over the edge.

"I could barely control myself today. All I wanted to do was to kiss her and feel her tits," he wrote.

Reading his admission was all I needed. I hit send and awaited his reaction.

"She did what? I can't believe it. She really sucked you off looking at my dick pic before coming over? No wonder…" he responded.

"Your daughter had never blown me so hard in my life. To be honest, I don't think it was me she was face-fucking. I think she was imagining it was you," I told him.

It was the first time I had been honest with myself as well. Shira wanted her father. That was now clear to me, and based on this conversation, Geoff wanted the same thing. The question was whether the two of them would allow themselves to actually go through with their desires.

I sifted through my pictures, desperate to find one that would provoke a reaction from Shira's father. As I searched, my phone pinged again.

"I've cum twice since the two of you left, imagining such a thing," he told me.

This was my chance to take things to another level. I opened up a locked folder I kept on my phone full of naughty pictures of my wife. Fearing that if I didn't act fast, I'd lose my nerve, I quickly chose a random photo from the folder and sent it to Geoff.

"Holy shit! That's my daughter?" he replied.

I stared at my phone, unable to believe I just sent him a picture of his daughter spread eagle, her tits and pussy bare, sucking on her dildo, and staring into the camera. It was a picture I had cum looking at many times, and now I knew Geoff would too.

"Your dirty slut of a daughter," I emphasized.

"This is so wrong," Geoff told me.

"If it was so wrong, would the two of us be as hard as we are. Cum looking at your daughter. I know you are jerking off," I said.

"How'd you know?" He asked.

"Because my hand is furiously pumping my dick, imagining you going to town on your daughter as she sucks me off," I answered.

"I'm going to cum. I want to fill her with my Daddy seed!" he exclaimed.

Reading that sent me over the edge. Shots of jizz erupted out of me, as every muscle in my body seized up. I sat there on the balcony panting, trying to regain my composure.

My phone pinged again.

"That was amazing. Thank you. I just licked my hand clean, imagining it was my daughter swallowing it. Good night," he said, signing off.

I'd never tasted myself before, but reading my father-in-law's comments got me curious. I licked my dripping fingers, lapping up all of my cream. I was shocked by the strong taste, yet I wasn't turned off by it. If anything, I found myself craving more. I licked off the rest before heading back in and washing up for bed.

I didn't know what the rest of the trip held, but I knew that nothing would ever be the same.

The next morning, I awoke to the sound of Shira putting on her new bikini. Her skin was dewy, and her hair still wet from the shower, which gave her an innocent, fresh look. Yet as Shira tied the delicate strings around her neck, I was reminded of how...