Fighting temptation

After masturbating with Cassie, things didn't escalate quickly. She seemed to view incest as something to avoid. And why not? Just because she liked being punished didn't mean she was willing to have sex with me. Incest is a rather massive taboo. Her hesitation made me realize I shouldn't be so eager to bone her myself, I had to think with my brain, not my penis. I couldn't just fuck my sister because I was really horny.

The funny thing it wasn't even that bad to be tempted by my sister but not actually have sex. It was almost this weird new fetish... having all of this sexual tension but not actually having sex. Yet we weren't offended by the other's urges. In fact, we seemed to be playing a weird game of being increasingly open about how we felt about the other, of seeing how far we dared go while stopping short of incest. If Cassidy wanted to play this game with me, I found it too much fun to not play back with her.

Still, the S&M and sexual tension was just one facet of our lives, which were increasingly spent together in every way, including many that had nothing to do with sex. On Saturday we cleaned the house and I washed the truck while Cassie cleaned the inside with the vacuum. Mom and Dad had raised us to take care of the things we owned, and the truck was the only transportation for both of us. I was glad she didn't slack off like she could have.

That night she asked me to get us some beer so we could drink. She's just 18 but honestly, she could have gone drinking with her lousy friends, and they wouldn't be looking out for her best interests like me. If she wanted to drink at home, that seemed a lot better. So I got us beer and we drank in the basement, playing video games from when we were younger. She played modern games for her job, as crazy as that was, but for fun she liked playing silly nostalgic stuff from our childhood.

Drunk Cassie flashed me her boobs and pussy about twenty times that night. So I flashed her my cock, which was funny since normally I just got annoyed and didn't stoop to her level. Now it all felt okay though. She wasn't out-of-control, and I never sensed that she'd hurl herself at me for drunken sex. Which would have been a mistake anyway, I think, I want her to fully consent if and when it does happen.

The next day, Sunday, we had to get brunch with our Aunt. I guess we didn't have to but she was our closest family anymore and wanted to stay in touch. She's in her sixties so of course explaining to her that Cassie plays video games for a living made about as much sense as if we said she had a job mining cheese on the moon, but she did understand the money Cassie was making at least. I had to speak with embarrassment about being a bank teller. I really wanted to get a job I wasn't ashamed of, but that was easier said than done.

We did Cassie's big Sunday stream then it was back to work for me. I had gotten my urge to hurt her out of my system for the time being, and besides, I couldn't be punishing her every day, the body does have its limitations. Her ass was still very bruised from Friday and she was sitting on pillows at home. At least she liked it, I'd catch her looking at her bruises in the bathroom mirror, she was fascinated with her bruises, it even seemed like she took pride in them. If I was a natural sadist who got off on hurting a (willing) victim, she was a natural masochist who actually enjoyed the pain and trophies from her punishment. We were perfect for each other... except for the pesky incest thing.

That was the week that Cassie went from brat to tease. She'd flash me more than ever, made a point of walking naked to the bathroom or even to my bedroom occasionally, and she was constantly talking about sex. But if I said something about how hot she was or how horny I was, she'd call me the pervert. I guess it was bratty teasing. Rather fitting for her, don't you think?

Like I said it was almost a new fetish. Being teased by my sister. I suppose a lot of guys would call it "blue balls" and think she was being a bitch, but it just made me horny. A woman joking about incest and not really being offended that her brother is horny for her? I thought that was hot as hell. I was having a blast seeing how far we could go, how lewd we could get, without actually having sex. Of course, actually having sex would be a little better, but she was still claiming she didn't want to have incest, so I had to respect that. But I could sure complain about it.

Friday night we decided to stay in. I cooked dinner since it was my turn and we each had a beer with our meal. I was trying to teach her responsible, social drinking rather than just getting shitfaced every time. I was pleased that she was willing to try to act mature. At least sometimes, of course during the meal she did flash her tits and say "Up here, Mike" pointing at her eyes when I was naturally ogling her bare breasts.

She did the dishes since I'd cooked, and being a spaz she got her shirt wet so she just took it off. I was losing my mind from all the teasing as I dried the dishes. A man can only look at perky titties and not touch for so long, even if they are his sisters. She turned and asked "Are we done?" and I said "Not yet". I leaned in and sucked on her right nipple right there at the sink. It was the first time I'd been so sexual with her and her nip felt so nice in my mouth as I sucked on it. She gasped and said "Asshole!" but it took her a solid ten seconds to even start pushing me away. I let her, but I knew she liked it.

We played old video games in the basement after dinner. She did put a shirt on for that but said "Better cover up so you don't rape me". She was increasingly making jokes like that. Still, we just had a wholesome evening playing games and drinking a few more beers. But she was wearing her yoga pants and a tight blue top so it wasn't like I was free from temptation.

Walking up the stairs that night she was jiggling her ass shamelessly. I'd had enough so I reached up and yanked down her yoga pants, exposing her ass with most of the bruising faded, and her shaved twat from behind.

"Asshole!" she said in surprise as I exposed her.

"Yeah, I can see your asshole," I said, teasing her for a once.

"Aaaah!" she screamed and ran upstairs. She was so offended she went right into my bedroom, though, and tossed her clothes in my laundry hamper by the time I came in.

"I gotta do your laundry?" I whined.

"Least you could do for getting to see a hot chick naked all the time," she said obnoxiously.

"Hey, you get to see a hot guy naked too," I said as I stripped. I work out too and was on the basketball team in high school. She just scoffed, but she was looking at my body nevertheless.

She brushed her teeth and washed her face then crawled right into my bed naked. This was really getting rather ridiculous. I could understand not wanting to break the ultimate taboo, but with her rubbing her sexuality in my face, how long was I really supposed to resist?

I came into the bedroom naked and pulled the sheets down to expose her body then started casually jerking off.

"Hey!" she said, in mock offense. "No free jerk-off material!"

"That boat sailed a long time ago," I teased, "Just let me cum before bed. You've gotten me all wound up."

She sighed but didn't try to cover up. "Well I guess it's better than you raping me," she said. Again with the rape references. Still, I didn't slow my hand on my cock.

"You're the one who keeps bringing it up," I said, stroking my dick as I looked at her sexy body sprawled out on my bed. "Do you have some kind of rape fantasy fetish?"

"What?" she said, obviously taken aback, but she sprawled out her body on the bed as if posing for me to jerk off to her nudity. "What are you talking about, moron? That's the dumbest thing I've ever heard!"

I just laughed and stood over the bed as I jacked off. It would have been hot if she'd admitted to having a rape fantasy, but yeah that was a bit much. I don't think I'm exhibitionist but having one willing girl watching me pleasure myself felt very sexy. "Spread your legs a little," I said, seeing how far I could push this.

She did, showing me the pink folds of her pussy as she lay on my bed. I groaned as I masturbated. Cassie's body in real life is better than any streaming porn video. She was watching my cock as I stroked myself, which only made it hotter. I looked at her nice perky tits and hard nipples. She licked her lips.

Fuck, I was cumming already. I didn't want to squirt my jizz on her. Well, I did, but I thought somehow that would be going too far, so I came into my hand as she lay on my bed. She looked a little disappointed, but at the same time I think she might have really freaked out if I'd jizzed on her that night.

I groaned out my orgasm. "Thanks for letting me use you for jack off material, Cass," I teased.

"Fuck you!" she said rationally. But she stayed in my bed, and when I came back from washing my hands and peeing before bed, she welcomed me into the bed and wiggled around until we were spooning naked under the covers. She was the little spoon, naturally, which had my dick resting on the back of her thighs. Now this was really pushing the limits but I guess it wasn't technically incest. I was learning to love those technicalities.

She was still wiggling around and I was about to snap at her to settle down, but I realized she was reaching between her own legs. She was masturbating after my filthy display. Girls don't really need visual masturbation material, at least not like guys do, but I felt like the evenings events had made her horny enough to need a nice masturbation session.

I held her naked body in the dark room under the covers. She wasn't trying to hide her masturbation, gasping softly as she touched herself. Her bare butt wiggled against my stomach as no doubt her experienced fingers played with her little clit.

"I love you, Cassidy," I said softly. The best part about our relationship was that the teasing and bickering was just for fun, it easily gave way to sincere love when the moment was right.

"I love you, Mike," she whispered. But was it sibling love, or a much more inappropriate kind of love? "Fuck, oh god," she said, then moaned passionately as she came, grinding her ass against my cock. She moaned incoherently as she had a powerful orgasm, then relaxed in my arms.

I knew that night that she felt both kinds of love for me, and I felt them for her.