We're working on science homework/studying together in preparation for an upcoming exam. I start accidentally slipping out closed-mouth burps with my cheeks puffing out. I let out a little moan after most burps but still am super embarrassed and humiliated. The burps become more frequent and harder to suppress, and I even accidentally burp talk a few times. Eventually (10 minutes in) it becomes too difficult to hold back, so I start letting out full-strength open mouth burps.