Under no circumstances do you use teeth in a bj. When making out and maybe you tug on their lip gently is super hot but teeth are not hot in any way in any situation when it comes to the penis.
I don't care how hot and heavy we were getting or if the girl looked like a victoria secret model. If she started using teeth around my genitals I'm shoving her off and saying "fuck this shit" and leaving.
I see it was a puppy dog. When you play with a puppy, it might bite. But even if it means to play, it doesn't know how to bite without force/without hurting you. Unfortunately, some girls bite like the puppy