I got into a sexual relationship with my stepdad just before I turned 18. Which I know sounds super sketch on the surface. But he didn't molest me or anything, I was the one who started it.
In fact I'd been *trying* to start it for years... my stupid crush on him was a big part of how I realized I was bi in the first place. But he didn't take me seriously at first... pretended not to notice all my ogling and perving on him, and laughed off all my clumsy attempts to flirt like I was just joking around.
It wasn't until he was headed towards divorce with my mom that he showed any return interest in me. Probably helped that I was 17 at that point and had grown into a twink instead of just looking like a gangly kid. Plus he was lonely and sexually frustrated and I was intentionally trying to get close and take advantage of that.
But even once we'd finally started getting cuddling and physical, he still held back from crossing the line to actual sex. Kept saying that I was too young (even though 16 was age of consent in our state, and also I'd already had sex with girls my own age by that point).
I eventually talked him into agreeing that we could try fooling around after I turned 18. But just having that agreement out in the open like that turned our sexual tension up to max. So it was actually a couple months before my birthday when he finally gave in and let me suck his dick. After that, the agreement turned into "okay, no anal until you're 18"... but then like a week later he got carried away again and popped my cherry.