She either has a phobia for sticking a dick in her mouth or he didnt wash his dick and it smells like swiss cheese. One way or the other, she is not able to give him a proper blowjob, after a few seconds of sucking she starts to complain and gag like its the worst thing she ever did. What a crybaby, it cant be that bad. And when he cums she acts like the world is perishing while he did tell her he was about to cum. Hate those girls, just shut up and suck.