Face-sitting & farting on my bf

I come home from work curious how my boyfriend's interview went, only to find out that he already got an answer and he's officially accepted to work for them. I get really excited and think it's time to celebrate and reward him for getting the job right away, so I ask him what he wants to do given that our roomie is not at home yet. Turns out that my dirty boyfriend would like to celebrate with some kinky action that involves me sitting on his face so he can smell my farts better and maybe even taste them if he's lucky :P but there's a little surprise involved, since I kinda feel like peeing out of the sudden...oooppps!