Just go over and ask where the bathroom is and then before he leaves leave the door wide open and start going to the bathroom and you know the rest
Does everything on this site have to do with the bathroom nowadays? Sheesh. I think that what you need to do is NOT starting using the potty while he's standing there - sounds that would turn him off.
Instead, you need to start talking to him, see what mutual interests that you have, spend time together. It may be that he's not right for you, or that he has no interest. But if you both click, then you'll have friendship to hold up your budding romance. Pay attention to him. Guys love that.
No that will never work what if he already has a friend he won't listenn to you! Ya need to impress g=him and realy catch his eye and that's the key to make your relationship last! He will dream about you!
Give the guy a woody- rub up on him innocently, bend down to pick something up so your face is right near his crotch- do some of that subliminal seduction stuff and at least he will have a wet dream about you Good luck