As I’m figuring Black out, I’ve come to find his body being inhabited by a very ancient Worm God who has no name yet but rides along being an eldritch abomination. It was born from a pile of massacred corpses and was called on by one of Black’s ancestors. A deal was struck in which the worm would inhabit a woman’s body and grant her an abnormally long life. Nothing could kill her, but the catch was that this thing would be passed down from mother to daughter. The worm would decide on the right offfspring for itself and inhabit the baby and so on. It feeds on and effects estrogen and emotions, and prefers female bodies over male ones as passing onto the next body is muuuuch easier (plus it can affect ones libido to extreme degrees to further enforce pregnancy when it wants to move onto the next body).
Black here though happens to be the first boy it comes to infest. Black is trans so... the worm never expected something like this, as Black takes full advantage of the powers it grants despite the very painful and horrific ways it mingles with Black. They have a love/hate relationship, as Black likes the abilities but fuckin hates the worm itself. He deals with it as he must and has decided he’ll just live till he can’t take it anymore. Pregnancy is frightening and he has no intention of it at all so... boy is gonna be alive for some time.