I'm looking for ntr games where the main character finds a girlfriend /mother / sister / daughter with whom he has never had a relationship fucking with different people (spying on their sex) and persuades or blackmail or in another way inclines to sex with himself but does not take it for himself and shares it with other heroes alternately or together.

the closest example:
(Youkai Tamanokoshi) Nozokibeya
Outmaneuver! NN Pick-up Beach