Yep,
When I was 25 at a wedding with my cousin. We're both the same age and kinda grew up together like playing doctor and shit like little kids sometime do. There was always this strange energy between us as we grew into adults. I couldn't help always staring at her goods and she never seemed to mind, actually encouraged it with sly glances. This went on for years and I never had the guts, or maybe the right amount of alcohol, to do anything about it. We had both gone away to college and I hadn't seen her in a few years until another family member's wedding. Everything was normal at the reception until I got on the dance floor. Like usual I dance with just about everybody in the family and she's dropping subtle hints as I'm dancing with her.
So after the reception me, her and a few other hardcores go out to a late night bar to finish ourselves off for the night. Bars close and the cab drops us off at the hotel, the other two people had rooms a floor below us and me and "Jenny" were in rooms next to each other. Needless to say we're all really loaded and as we approach our rooms we spot a couple of young hotties down in the lobby. "Jenny" says something that just about floors me - "There's a couple of hotties" she says, pointing to the young chicks "why don't you go down there and stick that big hard cock of yours in them". That stunned me for a second but I quickly recovered and the look she gave me as she was opening her door might as well have been a flashing billboard inviting me in. "I think I know just where I'm gonna stick it" I said as I walked toward her and into her room.
Man, it was fucking weird but in a real devious, dirty good way. There's an amazing element of turn on that only such a deviant act can provide and it was fucking exhilirating. We both knew it too, I could see it in her eyes and she could see it in mine. Morning family breakfast was very interesting, trying to ignore the fact that I had a finger up my sweet little innocent cousin's ass just a couple hours before.
We've snuck off a few times since then and as guilty as I feel, well as guilty as I feel is probably what feels so good about it.