“Stay safe, and remember to look after Kari!” Mom shouted as she and Dad walked out the door for their cruise. They have been in marriage counseling for a few years now, and at the recommendation of their counselor, they are leaving me in charge of my little sister Kari and the house for three weeks.

“Have fun and remember to call us!” Kari calls out from the loft above our living room.

As the door closed, Kari bolted downstairs, and sat down on the sofa beside me. “Jamie, what are we having for dinner?”

“Not sure, maybe order a pizza,” I responded.

“I’m not really in the mood for pizza. Maybe we could go out? My treat!” Kari exclaimed.

“Sure, maybe we could see a movie.”

Kari walked away thrilled as she announced that she was going to shower and get ready for our night on the town. As she walked away, I couldn't help but notice her sweet, juicy ass as she walked up the stairs and into the bathroom. I had always fancied my sister, but I had never dreamed or even really paid that much attention to how beautiful she really was.

So let me tell you a little about my sister and I. My name is Jamie. I am 18 years old, and I have light brown hair. I just graduated high school, and I am planning to work for a year to save money for college. I am six foot three inches tall, and I am on the thin side. My sister Kari on the other hand, is sixteen, athletic but on the curvy side. She has the best butt and thighs I have ever seen on any girl. She has perfect C cup breasts. She often wears really skimpy shorts and a sports bra around the house (not that I’m complaining). She has red-ish brown hair, and stands about five feet six inches tall.

As Kari walked out of the bathroom and toward her bedroom near the edge of the loft, she looked down at me in the living room. I tried to hide the fact that I was staring but she knew immediately. She let out a sheepish grin and dropped her towel just before closing her door, giving me a quick peek at her gorgeous bare ass. I noticed a bit of movement in my shorts as I ran to my own room to get dressed for the movie.

I heard Kari call my name while I was changing, so I ran out across the loft to see what she needed. I arrived in her room, only wearing the gym shorts I was wearing earlier. “How do I look?” she asked.

I was blown away by the short skirt Kari was wearing which outlined her backside perfectly, and the low-cut, sleeveless blouse she had chosen for the evening. Not quite getting rid of the effects from her bare ass earlier made it difficult to cover up what was going on down below. I’m not sure if she noticed, but if she did, she didn't seem to care.

After arriving at the movie theater, we didn't quite know what to see. Kari suggested the newest horror movie, remarking that she enjoys being scared. I was not too fond of the idea, but after seeing her excitement, I reluctantly agreed. Fortunately for me, the movie wasn't too scary, or at least in my own opinion. Barely halfway through the movie, I looked over to find Kari asleep on my shoulder, with her legs spread just enough to see her cute, sheer panties. The outline of her sweet pussy looked amazing in the light of the movie screen. Caught up in the view of my little sisters sheer covered pussy, I realized that the movie had ended and my sister woke up to the sight of me glaring at her crotch. She only alerted me of her consciousness with a teasing moan.

We then left for a local Mexican restaurant. We stayed long after we finished eating, just talking about this and that.

Suddenly I felt her bare foot sliding up my thigh. I jumped, and she immediately grinned and apologized in a teasing voice. Her feelings were becoming clearer, as I feared mine own feelings would become.

After sitting at our table for nearly two and a half hours, we decided it was time to go. I paid for the meal, though she promised it would be “her treat”. I was beginning to confuse this evening with my little sister for a date, and I was enjoying every minute of it.

By the time we got home, I was exhausted. “Hey, I think I’m gonna hit the sack.” “Okay! See you in the morning” she said eagerly. I went upstairs and went to sleep. At around six am I woke up as I always did to find Kari in bed with me in nothing but her bra and panties. Her skin was so soft. I couldn't help but caress her lower back and her stomach. She awoke after about a few hours of me constantly touching her sweet curvy body. She looked at me, smiled and proceeded to get out of my bed and head for the bathroom without saying a word. She has always been flirty around guys; even with me. But it was never like this. Never before have I woken up to her lying half naked next to me in bed. The confusion was unbearable. Has she just been lonely lately? Or does she want me?

I walked downstairs and greeted my sister. “I think I’m going to go for a run. Wanna come with?”

“No, I need to do some yard work. Thanks though.”

“Well that sucks. I was looking forward to spending the morning with you.” as she winked at me. “I guess we will have to see each other later.” She replied. I couldn't believe how hot she looked in her tight knee length yoga shorts and sports bra. I cleaned the house and mowed the lawn while she was gone.

I went upstairs to jerk off, as my sister was still out of the house on her run. I went to my typical porn site and grabbed some lube from my nightstand drawer. Only seconds from orgasm, Kari walks into my room, shocked from the sight of her big brothers 7 inch cock, she gasped with embarrassment. I assured her it was okay, as I was beginning to assume that she was a virgin, as she appeared to be completely dumbfounded by the sight of my cock.

“I’m so sorry, I uh didn't know!” She screamed.

“Shhh. It’s okay if you want to see it.” I said without thinking. I should've been covering myself. I should’ve been thinking how wrong it was for her to see me like this. I mean she is my baby sister, but for some reason, it was okay.

“Can I touch it?” Kari asked. She hesitantly reached out and grasped my cock. The slightest touch from my little sister was almost enough to make me cum. I was amazed as it normally took me an hour or more to even come close. She began stroking my cock. She seemed to enjoy pumping it, as she began gripping it tighter and pumping it faster. I closed my eyes and enjoyed my little sister jerking me off.

All of a sudden, I feel her soft silky lips wrapped around the tip of my pole. I opened my eyes to see my gorgeous sister’s innocent face bobbing up and down on my cock. She cupped my balls and swallowed my cock down her velvet throat.

“I’m cumming!” I screamed as she pulled my thighs into a thrust as I was fucking her throat. I slid out of her mouth as I began to spill my seed all over her face. She stuck out her tongue, receiving the last shot for cum from my throbbing cock.

She got up from my bed, heading toward the door. “See you later, big bro!” She said. I knew not what she meant by that statement, but I was eager to find out.