Rules of doing it with a trap and staying completely heterosexual:
You let the trap suck yours, but you are also allowed to suck his too and stay completely heterosexual.
You MUST stroke his cock WHILE you fuck him, the trap is allowed to give you handjobs, though you would probably enjoy blowjobs from him more.
Now this is the main course, before you give him your cock, you play with his asshole with your finger first, make sure that ALL of your cock goes in the ass and remember to stroke his cock while your cock goes in and out of him.
Also, come inside him.