Caught in the Moment at My Flatmate's Party

So here's the deal, I'm Alice, and I'm a first-year law student. Been dating casually for a while but nothing exclusive yet. Anyway, last night was my flatmate Jake's party. Everyone got pretty wasted, which is saying something since most of us are already used to it by now. I knew this guy Eric, a friend of one of my other mates, was eyeing me all night. Kept on giving me those looks that made the back of my neck tingle and the butterflies start fluttering in there again. After a few rounds, we ended up having a private chat away from most people; it was getting hard to breathe with so many bodies crammed into such a small space. Anyway, Eric and I were in this room off the main area, just chatting, getting to know each other better over drinks. He mentioned something about wanting to explore some more 'intimate' territory tonight, nothing too extreme but he did admit to being curious about kink play. I didn't really say much back at first; I was still processing what he'd said. Then we kissed. It wasn't anything super serious, just a little taste test of how things might feel if we decided to go further later on. But then, damn, things started getting heated. We ended up in one of the bedrooms, with clothes flying off and hands all over each other. He was into handcuffs and blindfolds; it wasn't my usual thing but I trusted him enough to give it a shot. Long story short, we did end up having some pretty wild kinky sex that night. No regrets about it either, was one hell of a ride, but yeah...the morning after was weird when I had to face everyone again in the common room with sore bodies and questionable stares from my other flatmates. We didn't really talk much since then; kind of left things open-ended. So, here's my question: Am I the asshole for hooking up with someone I barely know? I mean, it was consensual and we both had a good time but...should I have just said no instead? What do you think?