I got this from a guy earlier today and for me anyway, it was like the most hot thing ever.

Little things progressed between my sister and I to where we would hang out in the basement playing nintendo or whatever, but some times she would ask for a back and leg massage... These started pretty innocently, but slowly progressed to definitely blur the lines. I think we were both horny, and wanted to touch and be touched sexually, but didn't know how to communicate that and were afraid to, you know, cause it was pretty wrong. So it evolved from that innocence along many months until when shed ask, without actually saying so, I knee what she wanted, and I would have my hands around her upper thigh, like you'd choke someone, the sides of my finger along her slit over her tights, or up her shorts and over her panties, and she would kind of slowly grind against my hand. I could feel her heat and wetness. God, it was hot. I'm getting hard as I'm telling you this. Back then she had the hottest, tight little body.

I remember the first time that I got REALLY brave with my sister. She was 15. I was either 16 or 17. It was a summer afternoon, we were both kinda bored, it was super hot outside, and we were staying inside to avoid the heat. We were home alone. Dad at work, and mom was at one of her many club functions. All day, we were kind of picking at one another, play fighting over the remote, stuff like that. I think the boredom and close proximity was making us both horny. Who knows. I know I would lay on my back on the couch, tucking my aching and half hard cock in my undies in a way that pronounced the bulge, hoping she would look. She had on some short mesh running shorts and a t shirt. Eventually, she asked for one of her massages. Or maybe I asked if she wanted one. I can't remember which... But that was kind of our understood code that the person bringing it up wanted to touch the other one in the way that developed between us in an unspoken way. Anyway, she pulled up her shirt and layer on the floor of the living room and I straddled her hot, firm little butt, making sure she could kind of feel my bulge pressed between her buns. I'd always start by kneading her shoulders, then slowly touching lighter and lighter, so I was barely caressing w just my fingertips along the length of her back, and down her rib cage, brushing the sides of her breasts that were mashed into the floor. She would kind of arch her back so that she would be pushing her butt into me, and I'd adjust my hard on to be between her buns, and we would rub like that. This day I was so horny I thought I was gonna cum in my shorts. I was raking my fingertips more and more along her lower back and hips, leaning in to kinda whisper "does this feel good?" cause I was afraid and nervous to go to far. And she kept saying "mmmhmm" So I kept going. Now and then putting my fingertips under her waistband and very lightly lifting or pulling on it a little, and she would push her ass into me, lifting her hips up. (I hadn't done the leg rubs like I told you quite yet, but that happened later that summer) Anyway, my head was pounding w lust and I was throbbing hard... I put my fingertips under her waistband of shorts and panties and slowly started to slide them off her perfect little bubble butt. And she said "mmm that feels good" when I started to massage her hips real low. I scooted down so I was sitting on her thighs and slowly peeled her shorts all the way down. She had her back arched to push her butt up, and it was bare as she layed on the floor. The waistband just on the very bottom curve of her butt and I started to massage and knead her bare butt. She kinda moaned so I kept going and I'd squeeze and I spread her buns. At that moment I could see her pussy from behind and she was soaking wet. A string of wetness ran between her outer lips cause me spreading her ass like that spread her lips a little. My thumbs were so close to her lips but I didn't ever touch them. Instead I was just going between squeezing and kneading them and doing super light caresses on her buns, up to her hips and lower back and ribs, afraid to spend TOO much time. We did this for almost an hour, and I could SMELL how aroused she was. It was incredibly hot. I never touched her pussy though. But now I know she must have been aching for me to. Then the house phone rang, making us both jump in absolute fright... Collective guilt and adrenaline set in and we stopped for the day, both of us scared, probably still horny, feeling kinda sick w guilt, etc. It was one of her friends calling, and she ended up going over to her friends house for rest of afternoon.