My mother had invited me and my girlfriend to come stay for a few days. She of course 'just happened' to mention that my twenty year old younger sister Elizabeth would be there too and it had been such a long time since the whole family had been together. I'm sure she did miss us but I think the invitation really had more to do with her wanting to meet Rachel, who I had been seeing for just over six months but had never met my parents. Rachel said she was okay with it so I shrugged and told mom we would be there.
The weather actually turned out to be pretty nice while we were there and we spent a lot of time outside. Rachel hit it off quite well with both my parents and my sister but still stuck fairly close to me most of the time. One afternoon were sitting out next to the pool sipping on drinks when she made a comment that almost made me spit mine back out.
"You know, your sister kinda has a nice ass," she said.
A quick glance around the area confirmed that no one else was close enough to hear; dad was still at the barbecue, mom was inside somewhere and Liz had just surfaced from diving into the pool. Presumably Rachel had taken the opportunity to check her out before she had jumped in.
One thing I had never figured out about Rachel was whether or not she was actually into girls. I'm pretty sure she just liked teasing me, and let's face it there are significantly worse ways to be teased, but every now and then she would say something that left me unsure. Like remarking on my sister's ass for instance.
"What the hell Rachel?" I hissed.
She broke out into that weird smile she always gives me when she messes with me and tilted her head a little.
"What's the matter? You know I'm right." I shook my head but she persisted. "You gonna tell me you never once checked her out? Not once?"
"Okay, maybe a couple times," I relented hoping it would satisfy her. "But she's my baby sister, you don't think about that kind of thing y'know?"
"I know, I'm just teasing. You still love me right?"
Rachel whipped out her puppy dog eyes on me and I sighed dramatically.
"You know I do, even if I don't understand why sometimes."
"It's 'cause I'm hot and I put up with you," she explained patiently.
"Oh yeah, that's it."
I smiled and leaned in for her apology kiss before settling back into my chair. Only a few minutes afterward Elizabeth pulled herself out of the pool and I shook my head slightly to myself. I didn't understand the idea of swimming for a couple minutes at a time then taking a break but she seemed to enjoy it so who was I to say anything.
Despite my protests I found my attention drawn to my sister's body as she picked up her towel and dried off. It's not like it was my fault she looked good in a swimsuit was it? Realizing Rachel would be watching me I turned back to her to find her smirking knowingly at me.
"Whatever, you're just jealous you don't have a hot sister," I said.
I closed my eyes and leaned back hoping to avoid any further teasing but was actually surprised by her response.
"I kinda am actually," Rachel said wistfully. "I never had siblings growing up, you're lucky."
She seemed completely serious which, while not unheard of, did throw me off balance a little.
"Well it's not always that great really," I said. "I mean don't get me wrong I love my sister, but I've heard horror stories from other people and even me and Liz don't always get along."
"Always wanted a big brother," she said, completely ignoring me. "I used to have a friend who lived a few houses down the road who had an older brother. I think he was probably my first crush. Bit weird crushing on an older brother figure I guess, but what can you do?" She looked at me with her head tilted slightly. "You think Liz ever thought about you that way? Maybe we could compare notes."
And we were back to the teasing, that didn't take long. I was saved from a conversation I was unprepared to deal with by my sister who came over to join us with her towel draped over one shoulder.
"Hey, what you guys talking about?" Elizabeth asked.
"Siblings," I said. "Rach thinks you're lucky for having a brother."
"Aw, of course I'm lucky. I wuvs my big bwuvver," she said and gave me a big hug.
I noticed immediately that although she had towelled off, her suit was still wet. Her top left a big damp spot on my shirt causing both girls to giggle as Liz sat down on the chair beside us. I didn't really care about the shirt but I was somewhat concerned about the hug. My sister had pressed her boobs into my chest pretty firmly in order to get me as wet as possible and I couldn't help but notice how nice they felt against me; just like if they had belonged to any other girl.
I wished Rachel hadn't said anything because now that I had started thinking about Liz I was finding it difficult to get it out of my head. It would have been nice if there was some mechanism in my brain that would leave me incapable of viewing my sister as anything other than my sister. All I really had was a half-assed self-inflicted mental slap on the wrist anytime my thoughts turned inappropriate.
Fortunately with Rachel and Elizabeth getting along the way they were they could mostly carry the conversation themselves and leave me to my own devices. The only problem was if one of them decided to pick on me the other tended to back them up. Mostly I didn't worry about that so much but Rachel's comments regarding my sister had hit uncomfortably close to home and those kinds of thoughts were not ones I wanted anyone else to know.
****
I made it to bedtime without any further mishaps much to my relief. Rachel and I were sharing my old room which was right next to Elizabeth's. When I entered the room after going to the bathroom I found Rachel sitting on the bed in her nightshirt waiting for me. Oddly she had her hair up in a ponytail which was not something she usually did just before bedtime.
"Hey big brother," she greeted me cheerfully.
"Uh, what?"
"I'm glad you're back, I miss you so much when you're away," she continued. "Do you mind if I stay with you for a while? We hardly get a chance to be alone anymore."
So Rachel was pretending to be my little sister now, what the hell was that about? Unless our earlier conversation hadn't been quite as much about teasing me as I thought. I recalled her mentioning a brother fantasy earlier and despite myself I felt a small shiver run up my spine.
"Yeah, sure," I croaked.
She smiled and scooted over on the bed to make room for me. She lay on her side facing away from me and I instinctively spooned up against her and wrapped my arm around her waist.
"Mmm, you're so warm," Rachel cooed. "I wish we could sleep together every night big brother."
There was a subtle emphasis on her final two words as though she was trying to make sure I was going to play along.
"I bet you do, but I don't think that's all you want."
"What do you mean?" she asked, feigning innocence.
"I mean you jump in my bed with hardly any clothes on, you're being bad aren't you little sister?" Emulating Rachel I stressed the last two words of my question.
"Nuh-uh, I wouldn't do that," she protested, shaking her head.
"Really? I think you would. Are you even wearing panties under your shirt?"
I was gambling a little on that one, but knowing Rachel I didn't think there was much risk of being wrong. When she didn't answer me I knew I guessed correctly.
"Well, aren't you going to answer? Do I need to check for myself?" I asked.
Rachel continued to shake her head into the pillow but made no move to stop me as I slid my hand up her bare leg under her shirt. I took my time running my fingers lightly over her thigh and I felt her legs part slightly for me.
"Just what I thought little sister, you're being a bad girl aren't you?"
"I'm sorry, I can't help that I'm like that. Please don't tell daddy," she begged.
I had to admit this new game was really turning me on. If I had known this was what Rachel was working toward when she had been teasing me earlier I probably would have even played along a little.
"Don't worry baby," I whispered in her ear. "You may be a bad little girl, but you're my bad little girl. I wouldn't let anything happen to you."
"Promise?"
"I promise," I assured her. "I love my little sister and I'm going to take care of her always."
Rachel squealed softly and squirmed against me as my fingers ran gently over her pussy. She usually kept it nicely trimmed but as I explored further I realized that she had shaved her it completely bare. I had no idea when she had found time to do that but I didn't really care either, I was too busy enjoying the feeling of her smooth cunt.
"Mmm, you feel so good down there. So wet," I added as I slid a finger between her pussy lips.
"You like it? I didn't know if it would be okay," she told me nervously.
God Rachel was playing her part well.
"I love it baby. And it's all mine isn't it?"
"Yes," she hissed as I slid a second finger inside her. "It's all yours, anytime you want. No one else will... ooh," she trailed off as I found her clit with my thumb.
Rachel moaned appreciatively as my experienced hand worked her toward a quick orgasm. I was beginning to get worried about the level of noise she was making but there wasn't much I could do about it. My free hand was trapped between us and there was no way I was going to stop masturbating her while she was on the verge of cumming; I knew better than that.
Before long I felt the familiar tensing of her muscles as she came on my fingers and I smiled to myself. I was getting pretty good at that. When her moaning subsided and her body relaxed I carefully pulled my hand away from her pussy. Before I could move them far she grabbed them and pulled them to her mouth.
"I made a mess didn't I big brother? Don't worry, I'll clean you up," she said.
First she licked one finger up and down then the other before sucking them both into her mouth. I groaned as she cleaned her own juices off of me and pressed my body in tighter against her.
