A Case of the Chicken Pox

"Mark, can you come in here."

"Why?" I called from the living room.

"Just come in here," Jenny, my sister, called again.

I sighed and turned off the TV. When I got to her room I saw she was on the bed, stretched out on her stomach. She was wearing a tank top a little pair of shorts. Little dots of pink covered her from head to toe. My twenty-year-old sister - two years my senior - had just gotten the chicken pox and just as I did when I first heard that news, I laughed again when I saw all those little dots.

"It's not funny, Mark," Jenny said a little harshly. "These really itch."

I had gotten the chicken pox when I was nine so I was in no fear of getting them again.

"It's a little funny, Jen," I said. "Most people get the chicken pox when they're kids."

"Yeah, well, I didn't," she said. "Now, can you please put some Calamine lotion on me?"

I sighed. "Fine." I walked over to the nightstand, grabbed the bottle, and sat down next to her on the bed. Our Mom had been the one doing this, had seemed to really enjoy babying Jenny again, but she as well as Dad were at work.

"Can you just get the ones in the middle of my back?" Jenny asked. "I can't reach those."

"Okay." I put my middle finger on the end of the bottle and tipped it over and then started putting the white cream on Jenny's spots.

"Oh, that feels good," Jenny said, her voice a little muffled by the pillows. "Just put it all over."

I got all the dots on her back and a couple near the top of her shorts. I couldn't help but look at her butt. It was pretty nice, I guess. Maybe nothing to write home about but it had a nice little plumpness to it.

"Alright, well I think I got all of them. Oh, crap." I was trying to put the cap back on the bottle and it slipped out of my hands and a large dollop of lotion fell on her back and shorts.

"Mark, what did you do?"

"It slipped. I'll clean it up." I grabbed some tissues and began mopping up the lotion. I noticed that some of it had slipped under her shorts. "Uh, Jen, maybe you should get it, it got under your shorts a little."

"Mark, I can't see what's going on back there, just clean it up, will you? Here."

She put her hands at her sides and lowered her shorts giving me a view of a few inches of her crack. I immediately felt my face turn red.

"Uh, okay," I said and began trying to clean up all the lotion.

"Oh, wait," Jenny said after a moment. "Can you just rub it in there a little? That feels good, I must have some chicken pox there."

She did have some spots on her butt and I hesitantly began rubbing the lotion on them.

"Ahh, that feel's so good. Can you go a little lower?" She scooted her shorts down more. I paused for a second and then began rubbing again.

"More in the middle, Mark."

I didn't know if Jenny realized what she was saying but I began running my lotion-covered fingers down her ass crack.

"Oh, that's good," she said.

Suddenly this didn't feel right anymore. Putting lotion on her back was one thing, I mean, I had done that before with suntan oil, but this was something else. I felt my penis start to stiffen and I knew I should put a stop to this. But now Jenny was cooing softly.

"A little lower, Mark."

I moved my middle finger an inch lower and suddenly I wasn't just touching her skin anymore. My finger found her little puckered opening and immediately I stopped..

"Please, Mark," Jenny pleaded. "It really itches."

I paused again and then lightly touched her anus. I just rubbed the outside a little and began moving back up her crack. "No, Mark, lower."

I knew what she wanted me to do but I just couldn't. This was my sister. We weren't supposed to be doing stuff like this. But my increasingly engorged member was betraying my sense of morality. I touched her butthole again and this time put my finger in it about half an inch. Jenny moaned. "Lower," she said breathlessly. I saw her reach her right hand under herself.

I buried my finger in her ass up to the first knuckle and the shaking of her butt told me what Jenny was doing: she was playing with herself. I couldn't help myself and twirled my finger around in her anus like I had seen in an old porno once.

"Oooooh," Jenny squealed.

She bucked her hips up towards me, causing my finger to probe her deeper, and then slumped back to the bed. She was breathing hard.

"I think I just had an orgasm," she said after a few seconds.

I quickly pulled my finger out of her ass and got off the bed. My penis had thankfully returned to its pre-arousal state.

"I think that's my cue to leave," I said nervously.

"Oh, Mark, c'mon," Jenny said. She turned over and sat up. "It's not a big deal."

"Oh, sure, right. I just had my finger in my sister's ass, and she had an orgasm. You're right, that's no big deal at all."

Jenny laughed. "Relax, Mark."

"Uh, yeah, I'll see you later," I said, and quickly walked to the door.

"You'll come back later and put more lotion on me, won't you, Mark?"

I stopped in the doorway and turned around. Jenny didn't seem embarrassed or concerned at all about what had just happened. Maybe it wasn't really a big deal after all, I thought.

"Yeah, I guess so," I said, and she smiled.

I had gotten caught up in a baseball game on TV so I hadn't really given much thought to what had happened with Jenny. But when she called me back into her room a few hours later, it all came back to me. Jenny was lying on her stomach again, but this time she was completely naked. She must have just showered because her hair was wet and a towel was on the floor.

"Uh, Jenny, shouldn't you put something on?" I said.

"Nah, it's too hot. Besides, does it really matter if you see my butt now?" She giggled. "I won't turn over, okay?"

"Fine," I sighed, wanting to get this over with. Mom would be home in a couple hours and she could resume acting as Jenny's nurse.

I began putting the lotion on her back again but couldn't help but keep glancing at her ass. Now that I could see all of it, it was nicer and a little firmer than I thought.

"Okay, I think I got 'em all," I said.

"Wait, what about the ones on my butt?"

"Uh, can't you get those?"

"I can't see them, Mark."

"I'll get you a mirror," I said.

"Mark! Can you just do this for me, please?" Jenny said a little testily.

"Alright." I began putting lotion on the chicken pox on her butt. I was just using the tip of my finger and touching her as lightly as possible.

"Can you do what you did before?" Jenny asked after a couple minutes.

"Uh, I don't know, Jenny."

"Please? I think the soap I used made them itch more. Here, I'll help you."

She reached back and spread her cheeks and immediately I felt the blood rush to my cock. I now had a perfect view of her butthole. I stared at it for a few seconds and then put some more lotion on my middle finger. I just tickled the outside for a moment and then slowly inserted my finger. Jenny moaned. When I sunk my finger in further, she squealed. By now my dick was rock hard. Jenny wasn't the hottest girl I'd ever seen but that didn't seem to matter at the moment. I was exhilarated but at the same time mortified. This was my sister after all. But I couldn't seem to stop. I began finger fucking her asshole. I sunk nearly my entire finger into her and then pulled it out. I kept repeating that and Jenny quickly started playing with herself.

"Oh, oh, that's good!" she stammered.

It didn't take her long to orgasm again and just like before, she bucked her hips and then collapsed back onto the bed. Slowly I took my finger out of her ass. She leaned her head on her hand and looked at me, a big, goofy smile on her face.

"Mark, have you ever had anal sex?"

"What?" I sputtered. Jenny and I had always been pretty close but we had never talked about sex with each other before. But then again, now that I'd just had my fingers in her ass and had gotten her off twice, that didn't seem to matter anymore.

"Anal sex," she repeated, lifting herself further up. I could see part of her left nipple now.

"Uh, no," I said, quickly staring at my feet.

"Really? Never?"

"No, I haven't. Okay, I think maybe I should go now-"

"Do you want to? I mean, do you...wanna put that in me?" She gestured to the bulge in my pants.

I looked down and quickly tried to hide it, but it was no use.

"Jenny, I don't think we-"

"C'mon, Mark. Really, it's no big deal. Anal sex isn't even really sex. It's just my butt, it's not like you're gonna put it in my cooter."

Now I couldn't help but look between Jenny's legs and for the first time noticed I could see a little bit of her pussy.

"Jenny, I don't kn-"

"I'll tell you what. Just put it in for a minute, and if you don't like it, just take it out. We'll just try it. If you don't like it, that's it. I won't even turn around so I don't have to see your...thing. Okay?"

Before I could analyze her reasoning, I found myself standing and taking my pants off. She laid back down and turned her head to the side. Once I was naked, I got behind her on the bed and sort of straddled her. I'd only had sex a couple times and never from the back so I was a little uncertain.

"Just lean in more, Mark." Jenny spread her cheeks again. "There should be enough lotion in there to get it in."

I held my dick in my hand and kind of aimed it at her butthole and just brushed the outside.

"Good, just push it in."

Her anus was very moist and I was able to get the head of my penis in pretty easily.

"Oooh," Jenny said when the head had sunk in.

"What? Is it alright? Should we stop?"

"No, it's fine, it's just a little bigger than your finger. You can push it in more."

I leaned further in and plunged more of my dick into her. The sensation was wonderful but it was at that point when I came to my senses a little. This couldn't happen. I'd let things go too far before and now they were getting worse.

"Mark?" Jenny said when I'd stopped moving. "Are you alright? You don't want to stop, do you?"

"Jenny," I began, but she must of sensed my trepidation and just like before, she quickly brought her hips up and my dick went into her completely.

"Ugghhh," I cried and fell down on top of her.

"Stop thinking, Mark, and just do it. Your dick feels great by the way."

She bucked her hips a couple more times and suddenly I forgot all about my moral hesitation. I followed her lead and began sliding my dick in and out of her. The feeling was incredible; her ass was amazingly tight and warm it and felt like it was trying to milk me.

"Uh, Jenny," I said, trying to stifle a moan. "I don't think I can last too much longer."

"Good," Jenny said. "Just cum in me."

"Are you sure?"

"Yes, do it! I already came again."

I didn't need to be told twice and rammed my dick into her and unleashed my load. "Uhhh!" I cried as the last of it filled her ass. I stayed in her for another moment and then quickly pulled out and got off.

"I should probably..." I muttered and began gathering my clothes. Suddenly I was extremely embarrassed, mostly for being naked in front of her.

I saw Jenny take a peek at my cock and smile. When I was at the door she said "Thanks, Mark. You really scratched my itch," and then burst out laughing.

I was flooded with emotions: guilt, shame, regret. What had we just done?

"You'll come back later and put more lotion on me won't you?" Jenny called.

She was so casual about all of this so I decided I needed to say something, anything, about what had just happened. I turned around to speak but what I saw made me speechless, and suddenly all the guilt and remorse was gone and what I was left with was a stirring in my groin.

Jenny was up on all fours and her legs were spread wide and she was giving me a magnificent view of her asshole as well as her pussy.

"I think it will be itchy again pretty soon. Don't you?"