Stepsister's BF forces me to suck and fuck him with my natural tits

My stepsister's boyfriend is a total perv, and he's always trying to get me to do some naughty stuff with him. One day, he cornered me and forced me to suck his cock. I was scared, but also kind of turned on. After that, he had me bend over and he fucked me from behind. I'm a bit of a slut, so I didn't mind it too much. I even let him cum all over my natural tits. It was a wild experience, but I guess I kind of enjoyed it. The whole time, I was thinking about my stepsister and how much she'd freak out if she knew what was going on. But, I'm a young, wild 18-year-old, and I'm not afraid to explore my sexuality. Plus, my stepsister's boyfriend is pretty hot, so it could have been worse.