by Illogically_Horny
How about an F quirk that’s so unique, so powerful, that the futa has to be kept locked up in a secret facility? Like extremely potent pheromones, or cum so fertile that it takes a single drop just touching your skin and you become hyper pregnant? Or even a combination of both! She gets a massive case of blue balls when she stops cumming as part of an escape plan, and tricks her captors into sending someone in to help her.
Idea for a story could be if the virus undergoes a zoonotic mutation that allows transmission via animals, like real viruses can. End result being that the futas begin displaying characteristics of the animals they were exposed to, such as horsedicks,
Maybe something about food- maybe an F quirk that lets the futa in question have a full cum Diet, or maybe they eat through their dick?