I had been away at college for two semesters. So, when I came home for summer break, I discovered that a few things had changed. For instance, my kid sister Jenny had somehow morphed into a hot chick. I thought we had been close before. But that summer we got closer than ever.
When I walked into the house, I was greeted by my mom and dad. Then this sexy chick came up and hugged me. I literally did not recognize my sister at first. While I had been completing my freshman year of college, she had turned 18, graduated high school, and become a woman. I remembered her as a skinny, flat-chested tomboy. Now she suddenly had boobs, hips, an ass, and some very nice curves. As she hugged me, I started feeling some feelings that I probably shouldn't have felt for my sister.
She was barefoot, wearing short shorts with a crop top showing off her trim midsection. Plus, her hair was longer, wavier, and blonder. My sister looked like a whole different person. But underneath, she was the same girl I had grown up with.
I didn't get to see much more of her that day. Mom and Dad kept me busy as they caught up on my college activities and fed me dinner. Eventually, I retreated to my room to unpack and unwind. I was pretty tired after the drive from campus. So, I took a shower and sacked out on my bed to watch some TV. Later, my sister came in to visit.
I had left the door ajar, indicating that I wasn't doing anything private. Jenny rapped her knuckles lightly on the door as she swung it open and walked on in. She was dressed for bed, wearing the same kind of oversized T-shirt she had slept in since she was a kid. This one was tighter and shorter than I remember. It stretched taut over her breasts and let her thick nipples poke into the soft material. The shirt wasn't too long either, barely covering her crotch and ass, showing off the full length of her long shapely legs. I tried not to stare.
We chatted about what we'd both been doing the past few months. She wandered around my room occasionally bending over to check out some of my stuff, showing a glimpse of her bare butt. Either she was wearing a skimpy thong, or nothing at all under that shirt. Jenny finally plopped down on the lower corner of the bed. My eyes kept being drawn to her chest, her hips, her legs, her hair. She had to notice me looking. Eventually, I felt like I had to comment.
"Looks like you've really filled out lately," I said awkwardly.
"I know, right? I was beginning to think I'd never get boobs. Then boom! I got all this." She gestured up and down her body. "Mom even made me go on birth control a few months ago. Just in case, you know."
"Probably a good idea," admitted.
"I haven't done anything yet," she said looking away shyly. "Not really. I mean, I've messed around with a couple of guys, but I didn't let them get very far." She put her hand on my bare thigh and leaned toward me like she was sharing a secret. "Some of my friends talk about how their first time was weird and painful, and they wish they could do it over. I want my first time to be with someone I know and trust. Someone I'm really comfortable with, you know?"
"Sure," I said, "Sounds like you've given it a lot of thought. Are you thinking of anyone in particular?"
She smiled, and lazily trailed her fingertips across my leg. "Yeah. I just have to get him on board with the idea."
"I can't imagine any guy saying no to you."
"We'll see," she said standing up and tugging her shirt down. "I'd better get to bed. You're probably tired anyway. Maybe we can hang out by the pool tomorrow."
I was about to reply, when she leaned down and kissed me. It was on the cheek, but near my mouth. And that was something she had never done before. Then she turned, and left, closing the door behind her. I got up long enough to lock the door and turn the light out. Then I masturbated thinking about my sister's body.
The next morning, I slept late then spent some time putting away my college stuff and organizing my room. Mom and Dad had already gone to work, so it was just Jenny and me for the day. I went across the hall and knocked on her door without opening it.
"Hey, I'm going out to the pool," I told her. "Are you coming out?"
"Yeah," she replied through the door. "I'll meet you out there."
I went back to my room, put on some trunks, and grabbed a towel. Out by the pool, I pulled a couple of chairs into the sun for us. I have to admit, I was looking forward to seeing more of my sister's new body. But I had brought a book along as a distraction. As a 19-year-old guy, I had a lot of erections about a lot of women. But last night was the first time I'd had one over my own sister. That kind of bothered me and kind of excited me. In fact, as I lay there thinking about it, I felt my cock beginning to stir to life again. I tried to cool down before Jenny came out.
Just then I heard the back door and turned to see my sister wearing the skimpiest bikini I have ever imagined. It was literally a few pieces of string and three small triangles of cloth. It was the kind of swimsuit that would almost certainly come off if she attempted to actually swim in it. As she approached, I said out loud what my brain was thinking, "Wow."
She struck a mock model pose and asked, "You like?"
Instead of actually answering, I asked her, "Do Mom and Dad know you wear that kind of thing?"
"Of course not," she answered spreading a towel on the other chair. She also turned the chair opposite of mine so we could have a face-to-face conversation. "But Mom and Dad are not here right now. And I want to get a good all-over tan."
I marveled at her beautiful body. She had always had a pretty face, but now everything matched. The previous year, her physique had been fairly boyish. Now she had curves in all the right places.
She arranged herself face down on the lounge chair and reached behind her to untie her top. That didn't seem very necessary since the string was so thin it was almost like fishing line and couldn't have made much of a tan line.
"Oh, dammit," she exclaimed. "I forgot to put on lotion and I've already undone my top. Would you put it on me? I don't want to burn."
"Um ... okay," I said hesitantly.
She handed me the lotion and I began slathering it on her starting at her shoulders. Her skin felt so good. Smooth. Soft. Warm. My hands slid smoothly all over her back and around her hips, then I skipped down to her legs.
"Don't forget my butt, and between my thighs," she directed. "I really don't want to get a burn there." She spread her legs a bit to allow me greater access.
I hesitantly spread the lotion up the inside of her thighs and over the beautiful round cheeks of her ass. She made some "mmmmm" noises under her breath. That and the feel of her skin was making my cock hard beyond my control.
When I finished, I lay back in my chair. She turned to retrieve her lotion and saw my erection tenting the front of my swim trunks.
"Looks like you're enjoying yourself," she commented, pointing her eyes at my crotch.
"I'm sorry," I said laying my book in my lap. "I ... sometimes I can't control that."
"Don't worry, Bro," she said. "It's kind of a compliment. If I can turn on my own brother, I can probably have that effect on any guy."
"I'm not sure that's a good thing."
"It's cool, dude. I'm planning to be very careful. I wouldn't be dressed like this at a public beach or pool. This is just because I trust you and I'm comfortable around you. And I'm sure you wouldn't do anything that I wouldn't want you to do."
We soaked up the sun while I tried to read my book. But Jenny's ass was right there, and my eyes kept drifting. After about twenty minutes, she stirred and began to turn over.
"Hey, you don't mind if I leave my top off do you?"
While I was deciding how best to answer, she turned over and pulled the tiny top off, laying it to the side. And there were my sister's beautiful breasts on full display just to my left. If I leaned forward a bit and reached over, I could have touched them. She decided to lotion up this side herself. But it was nice watching her rub all over her body, her legs, her stomach, her boobs, her arms. When she finished, and lay down, she spread her legs and angled her knees to get some sun on the inside. This gave me a good view of her crotch and the narrow strip of cloth covering it. I could see smooth pink skin on either side. The upper part of the cloth was really low and I realized something.
"Hey, do you shave?" I blurted out without thinking. I was immediately embarrassed, but she didn't seem to care and knew exactly what I meant.
"With this suit, I kind of have to," she explained. "Besides, it's kind of a trend these days. Plus, I understand it makes oral sex more enjoyable for both parties. Do you find that to be true?"
"Ummm...," I stumbled.
She looked a bit irritated and chastised me, "Dude, you've got to get past this. Your sister's hot. We're both adults. And we can talk about sex."
Jenny had become more mature in mind as well as body.
"Of course," I agreed. "I just have to get used to it."
"Your cock's hard again."
"Dammit."
She smiled, closed her eyes and lay back to enjoy some more sun. I held up my book and stared at her boobs.
When we'd had enough sun, we went inside, had some lunch and decided to watch a movie before our parents got home. We took turns in the shower and met in the family room. I wore just an old pair of gym shorts and a T-shirt. Jenny came in with a similar outfit and plopped down beside me on the couch. While we watched, she got cold, retrieved a blanket and covered us both.
She threaded her left arm though my right arm and put her head on my shoulder. Her right hand ended up on my thigh, just below my shorts. I tried to ignore it, but my cock noticed anyway. She idly ran her fingertips up and down my thigh, going a bit higher each time. She edged slowly up inside the leg of my shorts. I wasn't sure she knew what she was doing and wanted to think it was just an unconscious movement. But soon, her fingertips were nudging close to my balls.
"Jenny...," I started to say.
"Shhhh...," she interrupted.
