I wonder if this girl will agree to fight me?
You do what you gotta do in a fight, and if what you gotta do is smother the other girl with your massive titties then hey, go right on ahead.
Probably not an effective move unless you’re in this exact scenario, so be smart about it if you’re gonna try to pull this off. Your boobs need to each be at least the size of a small child’s head and, with any luck, the person you’re fighting will be careless enough to not suspect anything strange is going on when you start throwing punches wearing only a bra. Sneak attack, bitch!