"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.
