The mission begins at the asylum. On Mason's phone, you have to select the woman he met on a camping trip. Mason will ask you for a can of soda to start his animation with the NPC. Then, upon returning to the base, Luna will appear, telling you to visit Crow's House—the house that appears when you wet the electrical switch on the street map. At Crow's House, you have to find the guest room where Mason is through the glass with two NPCs. There will be an item on the floor in front of him; you have to pick it up. After defeating the ghost, head to the dojo. The girl on the left will tell you that you're not invited. Drop the item, which is a pair of her underwear, next to her. She'll turn around and let you into the dojo. Talk to Mason, and they'll find you a partner for the orgy.