She waits until her husband goes for business trip/work, then she has her lover waiting around near her house in a car. She tells what if we are seen then they kiss and go to the onsen trip. They have sex their until she's pregnant. This was a part 2 i remember
So the setup was that the actors and actress were in an inn type of setting. First one of the guy fucks her inside a room and then remaining fuck her outside giving creampies one after other, I think near the bath but not in the water. There was no story to it, no element of force. Everyone were happy (Yeah had to mention it cuz in most porn like this, the female enters the bath where 3 or 4 males are and they end up ra*ing her). The first guy was kinda shy. And i am not sure whether there were other girls alongside her or not.