HELP!!! After-Oral Hygiene?

Cameron
So, i'm preparing myself for my first time giving oral to this guy, granted my first time giving oral AT ALL. But i have a lot of questions. My main one, is how am i supposed to wash my mouth after we're done? Obviously i can't just stand up, walk to his bathroom, and brush my teeth. So how am i supposed to clean residual aftermath out of my mouth? I have OCD and  i strongly feel the need to stay clean, so what do i do? Gum? Breath mints? Travel mouthwash? What do i do?!?!