Graves has a distinctly male body, identifies as male, but has female genitalia. (yes, I am aware that in RL intersexuality is a little more complicated than that). I'm down with both a slow burn story where he's afraid to disclose this information to whomever he's seeing but they end up accepting him as he is and a PWP where he's just getting fucked deep and good.
Bonus points:

-Lots and lots of clit teasing, including oral sex, Graves being completely wrecked by it
-Graves being really wet and dripping and needy
-Graves' partner has a really huge cock - long, thick, almost intimidating. Detailed description of it sliding in Graves inch by wet inch, parting him, spreading him wide open, until he's impaled and quivering and dripping around it.
-I'm very much into mpreg if you want to go there.

As for possible partners - I am especially partial to Credence and Theseus Scamander, but I am up for Grindelwald and Newt too.