Orgasm question TMI need some answers

So today my orgasm felt different!! We had anal play with my bf(not anal sex) and while he was fingering my butt he just started licking my clit and I felt the orgasm coming and in few seconds it came! but it wasn't like normal!!! It wasn't exactly inside of my vagina like normal but more like toward my butt. Is it because there wasn't much build up on my clit because we mostly did the anal thing which felt great but I couldn't cum unless he ate my clit