Bruce trying to seduce Alfred, whose initial reaction is faint horror and rejection. Cue Bruce setting out on a mission of explaining very systematically to Alfred that he's mature enough to know what he wants and that Alfred is being entirely irrational about this whole thing.

Underage is fine, though I'd prefer if Bruce was at least 15 or 16. Young adult Bruce is fine, too.

Bonus if they eventually reach one of their "okay, Master Bruce, we do what you want, but we do it my way" compromises.