AYRT - Okay, but, 1. the characters can have whatever couch one wants to give them, and 2. the fact that the characters' kink is so strong and satisfying said kink is so good that they can't stop themselves from ruining expensive furniture about it is...part of why it's hot? YMMV, obviously, but I'm just saying, "My couch is $4K so I would never" isn't a particularly relevant argument here. My couch was $50 at the thrift store and I, too, would never, because I don't have a personal, real life watersports kink. But my characters might, and their couch costs whatever I want it to for story purposes.