As the girls left the bedroom dressed in only bikini bottoms and a towel, but carrying clean vest tops, they heard the front door open.
"It's only me" I shouted.
"Course it is," Jenny said, "no one else has a key".
"What are you two up to ?" I asked seeing my girls walk past wrapped in towels.
"It's a lovely day, we're gonna top up our tans. Didn't think you'd be home yet " Jenny continued as she walked right past me towards the kitchen, and the back door.
"Hello Daddy, " Sky said as she walked past. "I didn't kiss you this morning did I, so I will now"
As Sky leant in for a kiss, the towel she was holding fell, exposing her glorious breasts.
After the initial shock and lovely sight, I did the conventional thing and turned my head.
All Sky said was "Oooops", as she retrieved the towel and looked at her sister.
Jenny just shook her head and closed her eyes in a way typical of when a sibling makes a silly mistake.
I think I blushed, I have seen Jenny naked thousands of times, I have kissed, fucked and even eaten off of her, but with Sky I still need to keep my desires to myself.
As Sky adjusted the towel, I asked, "Have you girls eaten ?"
Both my daughters smiled silently in their heads and thought the same, "Oh yes, I've eaten", but only Jenny spoke, "not since breakfast Daddy, I was going to take a load of fruit to pick at, as we sunbathed".
"You two go outside, I'll sort the fruit" I said.
As the girls walked up the garden, Jenny said to Sky, "that was funny, you were right"
" I know " Sky replied, "let's see how long we can play him along ".
I watched as the girls walked away, but it was the scene in my minds eye which aroused me.
I played over and over the falling of the towel and the sight of the naked, full, firm breasts of my elder daughter.
I've assumed over the past twenty four hours, when they were encased in her bridesmaid dress, and in the t-shirt and vest top she has worn around the house, that Sky's boobs would be spectacular, and now I know it to be true.
I love Jenny with all my heart, and her body, tiny tits included, is absolutely delicious, but Sky has been blessed with tits which every man, or woman come to that, dream of.
My minds eye stirs the feeling in my groin, and I can feel my erection growing.
As soon as the girls disappear into the private area of our garden, I give them a few moments to settle, then call out, " Jenny, come back, give me a hand with this fruit"
The girls heard my call as they set their towels on the grass to lay on.
Each of my daughters watches the other, appreciating the naked breasts of their sister.
Sky tells Jenny, "Don't say anything remember"
Jenny replies, "I won't, and stay here Sky, don't come up to the house". Jenny puts on her vest top to walk back.
As Jenny walks back alone I release my cock. The view of her sisters tits still playing in my mind.
As she walks back into the house Jenny laughs at the sight before her.
"I saw you looking. Is that for me or Sky ?" She asks, meaning the cause of my erection, and walks right up to me, swaps my hand for both of hers, and carries on wanking me.
"Her boobs are great, you have to agree" I tell Jenny.
"And now, so is her pussy" Jenny informs me, with both hands still working my shaft its whole length.
"Tell all" I instruct her, as my concentration changes from the images in my head, to the sight and tits in front of me. The vest top allows easy access to caress the tiny tits.
Jenny's rhythm increases, wanking me quicker, as she says, "Her pussy is all smooth now Daddy, and we spent all morning playing. I love her nearly as much as I love you".
Jenny stoops and takes my cock in her mouth, but doesn't stop her hands working.
"Did you talk about me ?" I ask, expecting to be told 'no'.
Jenny frees her mouth, but not her hands, and carefully chooses her words.
"Not really", she lied, " I shaved her, then we played on my old bed".
Then remembering about Sky never actually having had any luck with other girls, Jenny added with pride, "she's never been with other girls, I'm her first. Oh, and she's only wanked a few guys from college, I'm sure she said she's a proper cock virgin".
As the sentence finished, Jenny filled her mouth again.
With Jenny's words still in the air, I smiled at the pride in her voice.
The movement of her hands, lips and tongue, soon brought me to a climax. As I continued to tease Jenny's pert boobs, her head only moved back a little. Her mouth never once released my cock, she just gave it room to fill with my cum, and swallowed it right down.
When Jenny was satisfied I had stopped shooting my load, she stood and kissed me, passing into my mouth the last drops of my cum, our tongues sharing the taste.
"Come on," Jenny said, all practical, "let's get our lunch or Sky will come looking for us".
As we both washed our hands at the kitchen sink, I asked, "so you girls played, and didn't talk about me at all ?"
"We played, and you hardly got talked about" Jenny lied again.
I don't know what I had expected. I must have hoped for more, but realized that having Jenny is so incredible, but to wish for her sister too, in not very likely at all.
I resigned myself to enjoying Jenny's accounts of their times together.
As we carried the trays of fruits, drinks and a of bottle of sun block, into the secluded area of our garden, Sky was laid on her towel, her naked breasts soaking up the sun.
As Sky saw us, she sat up, smiled, and asked, "I don't need to put this top on do I Daddy ? Its just like the beach really, you don't mind my bare boobies do you ?"
"Not at all" I said, but in hind sight, I could have sounded less happy about it.
I saw Jenny's smile as I set my tray down. Jenny obviously loves having a new sister.
Sky saw the sun block and picked it up immediately, "Oh, I'll need this" she said.
"I've not been topless at all this year, look how white I am".
Jenny and I both looked.
Sky had plainly been wearing a lot of vest tops this summer. Her body has the classic vest shape, drawn in 'tan line 'white, against a nicely tanned pair of arms, shoulders and cleavage.
Her full, white breasts, had centres topped with what could have been glacier cherries. Her red nipples standing so brightly.
The bikini bottoms Sky was wearing also showed the tell-tale tan lines of a girl who wears shorts a lot.
Sky handed the sun block to Jenny and said, "Do my back Jenn, then I'll do yours", and Sky faced away from her sister.
Jenny was more than willing to follow Sky's lead, for she knew Sky was definitely playing up to Daddy.
Jenny removed the vest she put on to walk back to the house in, took the sun cream from Sky, squirted some onto her sisters shoulders, and proceeded to massage it in.
All this time I am just stood there, not sure what to do.
My two daughters, 17 and 18 years old, are topless before me.
The elder one I hardly know, after all the time she has lived with her mother.
Should I stay, or return to the house ? Convention surely dictates I should not be here.
Despite my glorious relationship with Jenny, to Sky I am just her biological father, who missed out on all the growing up things teenage girls go through.
I always provided financially for her, but I now know I could, and should, have done a whole lot more.
Besides, despite having just been sucked off by tiny, delicious, 17 year old Jenny, I can feel that lovely stirring between my legs.
Jenny's voice breaks my chain of thought, "there, all done Sky, now do me".
As Sky takes the sun cream, she answers the thoughts going through my head, when she asks "Shall I do your back too Daddy ?"
I know that I should return to the house, but the sight before me is so very erotic, and I convince myself I can control the erection growing in my shorts, besides, they are my daughters, I need to learn to control myself.
"Sure Sky, please do, I may as well join you both" I say as I remove my shirt and sit on the grass.
Sky goes to cover Jenny's back, and immediately sees the all over tan of her sister.
"Wow !" she says, "you've obviously been out here a lot Sis. I never noticed inside".
The bright sun light really did exaggerate, both the tan of Jenny and the white lines of Sky.
Sky has already poured cream onto Jenny's shoulders, so proceeds to spread it around anyway.
When her hand reaches the bikini bottoms of Jenny, Sky playfully pulls the waist band to check how far the tan spreads.
"Yummy Jenn, an all over tan" Sky declares as she looks inside the bikini.
"It's a nice sun trap here, isn't it Daddy" Jenny states.
"It is, " I reply, at which point Sky takes the two or three steps towards me, squirts cream onto my back, and starts to massage it in.
As she reaches my shorts, I expect her to stop, but with a high pitched laugh she screams out the words, "how far does your tan go Daddy ?", and Sky pulls my shorts down, revealing the fact that I too have an all over tan.
At which point Jenny helps her sister wrestle me to the ground. In the process, one of us knocks over the tray with the drinks on.
All three of us are laughing, but even though my shorts are around my ankles, I can still break free from the two teenage girls.
As I escape, I pull my shorts up, still not sure if my behavior is all it should be.
Jenny and Sky are still on the grass, laughing, looking up at me.
