Drunkenly made out with best friend of a decade

I’m a lesbian and they’re nonbinary amab. We were at a gay bar and I didn’t realize how gone they were. They came in planning to kiss many people. I just wasn’t supposed to be one of them. They said it was “just a platonic makeout and that it means nothing” and I was drunk enough to say whatever and do it. We ended up making our three times. They ended up blacking out and not remembering the end of the night. So I’m left with this memory and they don’t. It wasn’t bad? I wasn’t drunk enough to not be accountable for my actions. I just decided to give in to peer pressure (it was more like peer encouragement). It just feels odd and I don’t know who to talk to this about.

I’m positive that it was genuinely just a drunken behavior and there’s nothing behind it for either of us. So why do I feel so odd?