So I'm visiting a friend for the weekend at a major university and we go out with some of his friends. We go sake bombing, which results in him and I drinking by far the most. We go back to his place and are having a little kickback still drinking and what not. This one chick I'd had friendly banter with throughout the night starts to come on to me. She drinks a lot at the kickback and we are both hammered at this point. Fast forward we go to the clubs for a few minutes and at this point she is all over me begging me to fuck her and pretty much giving me the easiest lay I've ever had. We walk back to her place and have sex for 2+ hours all the while her praising me its the best sex she's had.

I'm not trying to humble brag, but she loved it. Yet the next morning she says she blacked out but I remember everything pretty well. I feel conflicted about the situation as she blacked out apparently but I was cognizant enough to remember it all and perhaps less drunk than she was. She wasn't upset with me and didn't claim rape or anything but it was something she was more embarrassed about more than anything. Was it wrong for me to have sex with her? She remembers us having an 'emotional connection' and her wanting to hook up with me. I just feel conflicted that I walked the fine line between right and wrong.

What do you guys think? From an ethical standpoint...