Don't ever put anything that's been in a behind into or too close to a vagina without sterilizing it. If having a penis is what you consider to be "not a biological woman," then why ask what you already know the answer to? Lick it, suck it, bite it a little bit. Maybe just pick a fun letter or two and do that. While I love giving head, anything involving the butt does zero for me. Stimulating your dude's sphincter will make his knob throb as the abundance of tiny nerve endings in the anus and surrounding tissues shoot pleasure sensations through his penis with your every lick and nibble.
It is actually a very fun, intimate thing to do, especially if he returns the favor ; Make sure he showers first, then during foreplay work your hands down to his cock and then start to brush his taint with your fingers, then you can finger the outside of his asshone to see if he likes it and to warm him up.
Eating Ass: A Guide for the Straight Man
Cancer, Cancer Rising -- all we do is feel and give. He likes when I flatten my tongue and slowly drag it from his asshole to his balls so I can suck and nibble on them. All he has to do is look down at you and you will be on your back, hair sprawled about your shoulders and the floor or bed, your tits puckered up and your thighs in the distance. It's sort of a pun, sort of an assertion of my complete lack of masculinity despite having anatomy in common with most men. Feel free to share these in the Sexual Achievement Sunday threads that are provided by the mods. Get your tongue in there, get it wet. Okay, that makes sense, I guess.