Blackmailing the Family

A stroke of good timing turns the MC into the guy who always walks in on the wrong secret, and he decides to make it pay. He starts blackmailing his own family, then digs up something in their history that's bigger than any one member's dirty laundry.

The leverage doesn't stay in the house. His teacher and his principal get pulled into the same game once he realizes blackmail is just a business model. The endgame is a porn film company, and he's not picky about how he fills the cast.

The player runs the pressure campaign: find the secret, use it, decide how far to push each target before moving to the next one. Nobody in his orbit is off-limits once the company needs performers.