Irritation and pain after sex

So sometimes after going at it with my boyfriend for a long time, my clit, outter lips and inner lips would feel irritated and which makes using the bathroom painful for a while. When I got checked out, everything was normal. So I’m thinking maybe it’s the position, or how he tries to get super deep and kinda scoots if that makes sense. I don’t know, Can I get some feedback? And what can I do for relief in the meantime?