Not sure how to approach this situation

So I have a friend ( I will call them “A”) whom I’m really close with, the friendship is also a fwb sorta thing aswell. So I went over one night to their place, we’re drinking and having a good ol time. As the night goes on the invite someone who i will call “C” over, we’ll not soon after C showed up, A went inside for about an hour or so. Well me and C hit it off and shit happens to make it short and simple. Later in the night we all end up having fun, it ends and I leave to go hang out in the living room for the night. Well 5am rolls around and C wakes up and the fun happens again. A did not like that, A woke up yelling so C went in there while I situated myself out. As they’re talking A yells ( mind you this is all happening at 5am and I haven’t even slept) “ oh so you have to go in there and get your d*ick hard so you can come f*ck me” and went on to make a couple other comments. It’s important to add in that we’ve had done this multiples times together in the past and never once has A acted or even gave off the vibe of something was off. It’s been a couple days now since we’ve talked, I don’t truly know what to say to A.