Content Warning × Demonologist. Pick Demonologist: Perrons House on the diving-bell screen, pull the lever, and the bell opens onto Perron's House — the haunted mansion from Demonologist — instead of the old world.
The real house, built from your own Demonologist. Nothing from Demonologist ships with this mod: the first time you press Play, Melty builds the house from your own copy (about 2 minutes, once). Full textures, furniture, night lighting, cut-out foliage, working doors.
Something lives here. A demon (one of Content Warning's monsters) haunts the house: it roams room to room, swings doors open by itself, and hunts anyone it hears. A second one turns up later in the dive.
Film it. Your camera, your footage, your views — everything Content Warning scores still scores. Get back in the bell, close the door and go up to cash in.
Play together. Up to 6 players the normal Content Warning way (Steam invites), or straight from Melty's Play together. Every player needs Demonologist installed.
Picking Content Warning on the bell screen plays the normal game.