My much younger (12, 13 in May) cousin keeps coming onto me whenever we're together.
I would be more than happy to reciprocate, but the only time we see each other is during the monthly get togethers that the whole family (~30 people, +/- guests) attends, and the only time we spend more than a few hours together is during the camping trip that the whole family takes once a year.
She purposefully spends more time with me than the other girls her age, always walks next to me when we go on hikes, tends to hang on my arm, and sits up straighter when she thinks I'm around. I make sure not to discourage her, but I'm 30, so there's only so much I can do to touch and encourage the lust of a tween while my family is in the same room as us.
The thing that confirmed my suspicion about her wanting me happened back in October, during the camping trip. We'd rented a pair of cabins by a lake, and split up based on my mom's side (18 people) and my dad's side (12 people) because one cabin was smaller than the other. This meant that my cousin was in the smaller 2 bedroom cabin with me, albeit in the girl's room.
The day we got there, everyone swam in the lake, did a barbeque, played games, and had a good time hanging out. When it got dark, we turned in and went to sleep. I got up to pee in the middle of the night because I'd been overzealous in drinking water to avoid a hangover.
The cabin only had one bathroom, and the bathroom had its own door to the outside, opposite the door that led to the hallway inside. After I relieved myself, I unlocked the outside door and stepped outside to look at the stars that I could sort of see through the window.
While I was looking up at the night sky at 1-ish in the morning, I was struck by inspiration and decided to jerk it while looking at the stars. I mean, why not? I'd never done that before and since we were going to be there another 5 days, I needed to take the chance to get my relief while I could. I pulled over one of the paded deck chairs, pulled down my pants, and started stroking while thinking about how she looked in her swimsuit earlier.
My cousin usually dominates my masturbatory fantasies, and I remember imagining fucking her up against a rock in the lake when I saw something move out of the corner of my eye in the darkness of the bathroom.
At first, I panicked, thinking about all the innawoods shit I've read on /k/. I didn't move a muscle, but looked at the bathroom window as hard as I could without turning my head. I was sure that a skinwalker was about to open the door and kill me, when I saw that it was my cousin.
At first, I was relieved, since I was wrong about dying horribly, and I almost put away my dick to talk to her when it clicked. She wasn't making any noise, she was obviously trying to not be seen, and she was still looking after she got an eyefull of me with my dick in my hand. Hell, I'm pretty sure the only reason I saw her is because she had tried to get a closer look.
I decided right then and there to just keep stroking.
I'd gone flaccid from fear, but knowing that my sexy cousin was just a dozen feet away and probably touching herself was enough to make me diamonds in an instant. I took my time, and put off my orgasm as long as I could, but I think I only lasted a few minutes. Just thinking about her opening the door and asking to fuck was enough to set me off. It felt like I came a lot more than usual, and I just lay there for a while, giving her a chance to finish. Or leave, or work up the courage to come outside, or whatever she was going to do. After waiting for a bit, I cleaned up using my shirt as a rag. I looked at the bathroom, but there wasn't anyone at the window, so I walked back inside.
The moment I opened the door, I was hit with the musky smell of female arousal. That alone was enough to get me hard again, so I started jerked off to her scent before going back to my room and passing out.
We did all the usual stuff during the day, but she seemed to be even clingier than usual, so that night I figured I'd jerk off outside again and see if she would follow again. Maybe we could talk about our attraction to each other and mess around. Maybe even touch each other.