Check
these results. Sure, not all have black women but white MC + black woman is the most common type in games by far, especially in vanilla games.
I recommend
Vae Victis, where the MC can fuck 3 black women in 1 "miniquest" but only 1 is an LI. The "fiefdom" you'll want to look out for is Hawatia. If you want a VN where a black woman gets a lot of storytime
Haley's Story has a black girlfriend.