My sister lifted her head up and mumbled something that resembled that I should help her and her friend up to bed. I sighed and agreed.
I carried my sister up to her room, placed her in the bed, and went to grab her friend. I laid her carefully into the bed in the guest room, and as I started to leave the room I noticed that her skirt had risen up slightly to reveal her thin, white panties. As I imagined what she looked like underneath her panties I began to become more and more turned on by the second. Unable to help myself, I walked back to the bed and sat down next to her.
Just to make sure that she was actually sleeping, I shook her shoulders untill I was certain that she was out cold. I carefully ran my finger along her perfect, smooth thighs. I lifted her skirt all the way up and moved my hand closer along her inner thigh. Then, I nervously rubbed the outside of her pussy through the panties, and I could feel that it was warm and moist.
My whole body shuddering from excitement, I used my two index fingers to slowly pull down the underwear. I became fully erect by this point, as I gradually pulled them down to reveal her perfectly smooth pussy. I pulled the panties off over her ankles and tossed them aside, and simply stared at her perfect pussy and ass. I used one finger to run along her wet slit up and down.
As I glanced up along her body, I noticed that she had perfectly round, firm breasts. Over her shirt, I lightly ran my finger around her nipples. I slowly began to unbutton her shirt to reveal a very thin, pink bra. I removed the bra, to expose her round tits and cute pink nipples. By this point my pants were ready to burst open.
I unbuttoned my jeans and pulled them off, followed by my boxers. My extremely stiff dick was already pulsing from excitement. I began to stroke it, then an idea occured to me. I approached her face, and gently opened her mouth. I ran the head of my cock along her tongue, while I groaned from the pleasure. I stuck it into her mouth about as deep as I thought I could go without choking her. I slid it in and out of her mouth with a feeling of absolute exctacy. I climbed on top of her, faced the opposite direction with my dick still in her mouth, and with my tongue I gently parted her pussy lips. I proceeded in this 69, sliding my dick in and out of her mouth faster and faster while furiously licking her. Once I felt the urge to cum, I climbed off, and with a great moan I exploded all over her exposed chest. About four spurts of warm cum landed in a pool all over her tits. Fearing she might wake up and suspect why she was covered in cum, I grabbed her panties, wiped all the cum off with it, and but them back on her. Once all her clothes were back on, I smiled and left the room.