After a long day of posing for Lisa, Alison and I finally arrived back at our apartment. We'd been partially undressed or nude almost all day, and things had gotten so hot between us during the final portion that we'd ended up fucking just for the sexual release. The whole way home, we'd held hands, but we'd been silent; no doubt thinking about what had happened between us.
I watched her hips sway and took in the sight of her jeans stretched across her ass as she walked up the stairs ahead of me.
Ali leaned against the wall outside our apartment as I unlocked the door.
"I need a shower," she said.
"Do you feel dirty?" I asked. It didn't sound right coming out, and I immediately regretted it.
Ali just gave me a look before pushing away from the wall and walking into our apartment. She tossed her purse onto the kitchen table, grabbed hold of her shirt and began pulling it up over her head as she started walking down the hall toward her room.
Ali stopped and turned, shirt bunched up around her neck, breasts straining against her bikini top.
"No," she said, licking her lips, and taking a step back toward me. "I don't feel dirty, I feel wet. I still have your cum oozing out of me. It feels kind of..."
A smile like I hadn't seen before crept across her face.
"It feels kind of gross," she said. "And dirty..."
She stuck her tongue out at me and threw her shirt at me as she began unfastening her jeans.
I stood there looking at her as she unzipped and returned my gaze.
Ali turned around and faced away from me as began walking toward the bathroom as she slowly pushed her jeans down her hips, her thumb hooking one side of her bikini bottom and almost pulling it loose. I'd been fine once we got dressed and left Lisa's, but now, I felt my cock beginning to get hard again.
She stepped out of her jeans in the hall as she pulled the strings loose on her bikini top. Ali turned her head and looked back over her shoulder at me as she dropped her top and pulled the ties on her bikini bottom.
Ali held on to her bikini bottom as it fell away from her body. She knelt down and picked up her jeans and top and walked into the bathroom, shutting the door behind her.
My sister had a great looking ass, and her exposing herself to me like she'd just done had me hard again. Clearly, our relationship had changed, and things would never be the way they'd been when we'd gone to sleep the night before.
For the first time, I thought there might be a good chance she was flirting with me; not flirting to play, but flirting to tease and entice. I went into my room and undressed, lying down on my bed in my boxers.
A few minutes later, Ali came out of the bathroom. I quickly rolled off of my bed and stepped out into the hall, catching her in the hall, wiping water from her neck with the towel she held in front of her. Ali quickly ducked into her room, pushing her door closed. I headed for the bathroom, stripped off my boxers and climbed into the shower.
Several minutes later, feeling a lot better, I turned off the water. I had just started drying off when the bathroom door opened. Ali leaned in wearing bikini panties and a thin, white tank top, her nipples pressing against the cloth.
"Wanna watch a movie with me?" she asked, sitting on the edge of the bathroom counter and biting her lip.
"Sure," I said. "What do you want to watch?"
I continued drying off, keeping the towel in front of me.
"I don't know," she said. "I just... thought we could curl up on the couch together. I'm sure we can find something to watch. "
"We can do that," I said.
Ali smiled at me nervously.
Ali looked down, and I followed her gaze. She looked back up, her eyes a little wider than a moment ago.
"I'm gonna go get the movie started," she said.
"Okay."
I finished drying off and followed her out of the bathroom, naked, just like she'd been when she finished her shower earlier. I grabbed a pair of boxers and pulled them on, my cock an obvious bulge beneath the cloth.
All summer long, we'd spent more and more time together, actually sleeping together in the same bed more than once. Concern about modesty between us had apparently evaporated in the last few hours, and now, as my cock pulsed with the early stages of renewed arousal, I found myself, for the first time, consciously thinking of Ali as more than just my sister.
I walked into the living room; Ali was sitting on the couch, bent slightly forward as she worked the controls on the DVD remote.
"Is this okay with you?" she asked, flashing me a DVD case.
I nodded to her. It was a chick flick, but I didn't care. It was a pretty good movie, and I knew from watching it with her before that we would spend most of the movie cuddled together on the couch.
She finished fingering the DVD remote and sat it down on the end table beside her as I walked over to the couch. Her eyes locked onto my shorts, and then she looked up at me, her face turning red.
I sat down beside her and the movie started, our fingers finding each other and intertwining.
We were both restless, nervous, unsettled. No manner of position we took sitting upright was comfortable, and in a matter of minutes we were laying down on the couch, me with my back to the couch, Ali with her back to me.
"I can't believe you're hard again," she said, settling herself and seemingly grinding her ass into me.
"It doesn't take that long," I said, "and having you nearly naked and next to me..."
I wasn't sure how to finish what I wanted to say.
"What?" she asked, turning her head toward me. "Having me nearly naked and next to you... what?"
"It... you... you're beautiful, Sis," I said. "I can't help but be turned on by you."
I saw Ali's lips break into a smile. She took my hand into hers, pulling it to her chest, and I couldn't help but notice her rock hard nipples pressing against the cloth of her tank top, boring into my palm. A moment later, Ali adjusted her hand atop mine and moved my hand down her body, past her ribcage, down below the edge of her tank top onto the exposed skin of her belly and finally onto the gentle curve of her hip, past the scant line of her panties to her ass, and then bringing my hand back to her breast.
"I like the touch of your hand," she said, pressing my hand to her chest and then relaxing.
Halfway through the movie, my hand rested just below her breasts, feeling the rise and fall of her ribcage with each breath she took. The soft, fresh smell of her hair and skin filled my nostrils as her warmth radiated against me.
"Who was your first?" she asked.
"My first?" I asked. "The first girl I kissed, or...?"
"Who was the first girl you had sex with?" she asked, tilting her head and rolling her eyes. "I know all about Sara."
Sara was the first girl I kissed.
"Melanie," I said.
"I knew it!" Ali turned her head and licked her lips. "Kerri thought it was Susan."
"You and Kerri talked about who I slept with?"
Ali nodded, biting her lip lightly.
"Remember that night that she slept over?" Ali asked. "She and Lexi and I stayed up most of the night talking about just about everything."
Kerri, her best friend, had spent the night at our house back home one night before the start of summer school. Lexi, our younger sister, had turned eighteen three months earlier, right before graduating high school. I was suddenly beginning to see both of my sisters in a completely different light.
"Lexi was part of that conversation, too?" I asked.
"Yeah," Ali replied. "She's not the little kid you think she is. She told me about her prom date making the moves on her..."
"She and...?"
"No," Ali said, shaking her head. "She got cold feet after he felt her up and he dumped her."
"So, ...?"
"If she wants you to know," Ali said, "she'll tell you. Let's just say that graduation weekend was eventful for her in more ways than one."
"Oh, but the two of you can talk about me?" I asked.
"We speculated," Ali said, clarifying.
I nodded as Ali reached behind her, fingers rubbing softly at the bare skin of my upper thigh.