Alright this is probably a long shot but no matter.
I'm looking for this one doujin, and everything I remember about it is that it features a black haired futanari and a blonde female(or possibly futa).
Now I know the description is horribly vague but the crop from that doujin where the black haired girl (her facial expression was either neutral or angry looking, or so I remember) takes the blonde girl from behind was a really popular reaction image that got posted all the time.
Pic related kinda reminds me of it for some reason.
Anyone knows what am talking about?