Gradually, both Jen and I filled out a little. Nothing much. Jen got a little more hip, a bit more breast. My shoulders got a little wider. The months got colder and we did our naked thing a bit less often because of it, and when we did, more often than not we were under a blanket.

The thought that this was “wrong” never entered my head, though I was aware that a lot of people would consider it so. Or at the very least, they would think we were really weird. Still, that didn’t keep me, and Jen, from having a very healthy fear of our parents were they to ever find out, but as far as we knew, they never suspected a thing.

We were always very careful. We always did it when they were out, and we knew they weren’t coming back for at least a few hours. Once, when we got a day off from school, Jen and I spent the entire day naked. We only broke that trend once; Mom and Dad were home, but had been downstairs watching TV and we knew they were going to bed soon. Jen and I were in her room talking, and she was topless. We didn’t get caught (thank God), but we agreed the next day not to take a risk like that again.

Then came the day when all that changed. It was another Saturday, the parents were out, and Jen and I had been in the nude for some time. We were watching a movie. Jen was next to me on the couch, as usual, with her head on my shoulder. Out of nowhere, she shifted her legs up so that she was sitting on them, and hugged me, and gave me a peck on the cheek.

I gave an amused chuckle and tried to ignore the fact that I could feel her naked breasts on my arm. “What was that for?”

She sighed, and looked up at me. “For being you.”

“What’s that mean?”

“For…” She gestured to herself, indicating her lack of clothing. “This. I suddenly realized how comfortable I’ve become being naked around you. It’s really helped. I don’t feel ashamed to do it anymore, I don’t feel scared when I get in the shower.”

“Really? Well, I’m glad.”

“Yeah. I’ve really started to look forward to these little naturist hangouts we have.” She laughed.

I laughed with her. “Good. So do I. Not every day I get to see a naked girl.”

She snorted. “Almost!” We both laughed at that. I thought, we’d do it every day if we could. I had a sudden vision of us surprising our parents with the news. Guess what, Mom and Dad? We’re nudists! My daydream swung between them instantly dying of shame to them saying, “Us, too!” and stripping of their clothes. At which point Jen and I would have been terrified.

I was lost in thought for a bit there, so I didn’t immediately notice that Jen’s head, while still on my shoulder, was turned the wrong way. She was watching me instead of the TV. “What?”

“Nothing.”

I gave her a look and returned my attention to the screen, but my sister’s eyes remained on me.

I don’t know what caused her to do it, or why she chose right then, but I felt Jen’s hand move from where she had been hanging on to me to my knee. Before I knew what was going on, before I had time to say anything, she lowered her head, and a felt a warm wetness on the head of my cock.

I remember gasping. It was the shock. This had come out of nowhere, and I was paralyzed. Well, most of me – a certain part of my body was definitely responding. My dick rose and grew and stiffened inside her mouth. I felt her tongue gently caressing the shaft and I shivered when she swirled it around the head.

What surprised me was that I wasn’t disgusted, or horrified, or anything like that, at my own sister giving me a blowjob. What surprised me was the suddenness of it, and that some cold, logical part of my brain that was somehow still working was screaming that this was in direct violation of our no-touching rule. Then I thought, To Hell with that! She can break that rule all she wants to!

Jen’s head started bobbing up and down, and on every fifth or sixth one she slowed and took a bit more of me in, held it for a few seconds, and then repeated. Every time she did it I groaned, and this just seemed to encourage her.

Then I remember thinking, well, if she can break the rules, then so can I. She was nearly completely on top of my right arm already, so it didn’t take much for me to put it there all the way. I bypassed her breasts completely, heading straight for between her legs. My fingers found the patch of hair there, and then her pussy lips. I half expected her to protest, but she just moved her knees slightly apart, granting me access without a word. I intended to take it.

Jen let out a soft moan as I parted her sex with my index and ring fingers. My middle finger found the hot, slick folds inside and sought out her clit. Even if I hadn’t (correctly) guessed where it was and how it would feel, the moan of pure pleasure she let out told me when I’d found it. She briefly halted her work on me, and I felt her hips instinctively move, trying to get greater pressure from me. I was only too happy to oblige. After a few moments of teasing circular motions around it, Jen remembered what she had been doing and returned her attention to me with renewed vigor.

We kept going back and forth like that for a while. Neither of us had done anything like this, so we were having trouble doing both at once, but I don’t think either of us really minded. I certainly didn’t. Especially when she brought in the fingers of one hand to jack me off at the same time. I upped my game, too, by slipping my finger all the way inside her, making her squeal. If I thought she was wet before, she was even more so now. She’d told me she masturbated, but was reluctant to tell me exactly how. I wondered if this was how she did it. Either way, she wasn’t complaining.

After a while she slowed her blowjob to a stop, though she didn’t take my cock out of her mouth. Her body moved with my hand, fucking my finger, and she was letting out more and more urgent cries. With a bit of twisting, I managed to push my ring finger inside of her as well, and I found her clit with my thumb. She practically screamed around my cock.

After a few moments of this her whole body started shaking and tensing up. Incredibly, at first, I thought something was wrong, and I became terrified I was somehow hurting her, but after a second she relaxed and slumped forward. I could feel her skin heat up, could see a red blush around her neck. I realized that I had just given my sister an orgasm, and I felt ridiculously proud of myself.

I started to work my hand again, thinking she would want more (girls can get multiple orgasms, right?), but she clamped her hand on my arm. Slowly, I withdrew my hand from inside her, and she let out a groan that sounded like half pleasure and half relief. I could smell her pussy, even from where I was. Very, very slowly, she began her blowjob again. Having just given her one, I sat back and enjoyed my own as it built up. It didn’t take much more after all that.

“Jen… I’m gonna…”

She sort of nodded, as best she could, and worked faster. Half my body – the right half, for some reason – twitched, and I knew it was coming. “Jen… Jen, here it comes…”

Even with the warning I don’t think she was really prepared for what happened. I shot my load up into her mouth and she gave a surprised half cry, half cough. She did the best she could, but I must have caught her in the back of the throat, because she couldn’t quite manage to not cough as she finished me off. Finally she gave up, sat up, and coughed once, loudly. She cupped the hand she had been using on my dick to catch the remaining streams of my come. There wasn’t much, she had actually managed to swallow most of it (I was kind of impressed), so it mostly just dribbled between her fingers. She sat back on her heels and sucked them clean, one at a time, and I recall thinking that that was the hottest thing I had ever seen in my entire life.

We sat there for a while, breathing heavily. The movie played on, but neither of us were watching it anymore. The smell of my sister’s wet pussy was heavy in the air, drops of my come were on my deflated cock and on her chin and hands, and her whole chest, from breasts to chin, was flushed.

Finally, we looked at each other, and we gave each other shy, embarrassed smiles that bubbled into nervous laughter.

“Uh. Wow,” I said.

“Yeah,” she agreed.

Jen leaned forward and gave me another kiss on the cheek, then picked up her clothes and disappeared into the bathroom. I heard the sound of the sink running. Eventually, I got dressed, and when Jen came out, she was dressed, too. Our early warning system went off before we finished the movie.

That night, as we were getting ready for bed, I heard my phone chime, indicating a text message. I had been in my room all evening after we’d eaten dinner, reading. I pulled it up – it was from Jen.

“<3” was all it said.

I felt my lips turn up in a smile, and I typed back, “Just realized something.”

“What’s that?”

“This afternoon was the first time you’ve ever gone first.”

Two rooms way, through closed doors, I heard my sister laugh, long and loud.

“I love you, big brother.”

“Love you too, sis.”

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