This happened a few years ago, but it was probably the naughtiest thing I ever did.
Me and a friend gave a double blowjob, and how it started was, the three of us were drinking in a hotel room during a trip, and he dared us to make out. My friend was really drunk and was into him as a fling, so she pulled him in to make out with us. It got hot because he was touching us, and so she started giving him a blowjob while he was still kissing me.
I was also really drunk and started getting horny, so when he asked me to “kiss” his dick, I just reluctantly said okay. We end up taking turns between sucking his dick and making out with him. He’d pull my boobs out when we made out, and he eventually came in my friend’s mouth while having his face in my boobs.
To be honest, I did felt a bit used afterwards for the fact that I helped someone came, but not me. But what's hot about the whole thing was how much he seemed to love my boobs so much while he was cumming. But I still sometimes can’t believe I did something like that.