I haven't been able to make the scene with the family trigger for some reason. It just makes me lose the fight and kicks me out.
Viewing post in PURE NIGHT : Futanari Infection RPG comments
The order is important
First you wait a few turns until the mother jumps on you, then you beat the first daughter, and then you stall until the second sister jumps on you
Defeating the first Daughter before the mother jumps on you causes the mother to disappear, and that's likely what's happening to you