Hetopia

The story takes place in a mild post-apocalyptic where anthro males went extinct and females survived.

Without males, the heterosexual females will be suffered by the heat. So the lesbians, created a drug that can calm their heat, but the lesbians built a fort in order to keep all the straights in one room.

At first our character, Malisa a black sheep, will just deliver the drug and leave, but she will discover what bigotry that the fort contains.