I've experienced something simliar yesterday while visiting an ex-roommate's condo...his drunken & horny older bro got me kinda tipsy & I eneded up fooling around with him.
Better than taking his pants off would be getting him to the point where he’s sliding his pants off to offer you his needy hard cock with a look in his glassy eyes that pleads “Please, suck it!” Maybe even add in: “If you suck mine, I’ll suck yours!”