Oh, how about a reverse-Catherine? Like... Hmm... Brian? I mean come on, both genders have issues with relationships. Not all men are cheaters and lustful and not all women are... I don't know since I'm not a woman. So, basically Brian is an incubus as Catherine is a succubus and Bryan is the boyfriend as Katherine is the girlfriend. It can't be a climb-the-tower game or else it's basically a male version of Catherine which it technically still is. On-rails shooter like Sin & Punishment or Kid Icarus: Uprising? Puzzle platformer sort of like Portal?
Y'know what would be funny is if they hired the same voice actors and reversed their roles in a sense. Laura Bailey plays the leading lady, she was Catherine who caused trouble for Vincent, and Troy Baker, Troy played Vincent, can play as the seductive or shining-knight Brian - I don't know if Brian should exemplify the perfect partner or something "dangerous". Now I just realized that people have different "preferences"... Damn it all. Trying to make everyone happy is hard. Anyway, Michelle Ruff and Erin Fitzgerald are the main character's friends who somehow get mixed in the nightmares just like Vincent's friends in Catherine. And I guess Travis Willingham would be Bryan, the main character's boyfriend. The reason I say, "I guess", is because Travis is actually married to Laura. So maybe he could be Brian instead and Troy could be Bryan just to put a spin on things. That still leaves Liam O'Brien, Kirk Thornton, and Yuri Lowenthal. Oh, and I guess Nolan North can voice every unimportant NPC - male and female.