There's not a general genre tag in use for sleeping with two sisters.
I think the best chance of getting good results would be using the combination of "sister" and "insult" (read incest, assuming that the sisters also have sex with each other).
There's not a general genre tag in use for sleeping with two sisters.
I think the best chance of getting good results would be using the combination of "sister" and "insult" (read incest, assuming that the sisters also have sex with each other).