Please help

Sierra

So my fiancé always loves to eat me out, but when he does he bites and a little to hard. I tried to talk to him about it, but it doesn’t seem like he’s listening. I’ve just been letting him do it but it’s gotten to the point I don’t have pleasure in it anymore and it’s just awkward for me and every time he eats me out now the below gif is literally the face I make. What should I do?