Biting while teething

Re

My little guy is 8 months old and just started teething. He's taken a few bites and I've told him no and removed him from my breast. Well today one of his bites surprised me and I yelped a bit. He thought it was hilarious and now every time he gets that breast, he pretends to start nursing and bites instead. I can see he's doing it to see my reaction but I'm not sure how to deter the behaviour now before he makes it an ongoing game. I'm afraid to nurse on that side now. Help please!