Offline/Jet
If you want privacy then bunking with Jet and his girlfriend has to be best. They probably want nothing to do with you, which is exactly what you're hoping for. That way you can have your cabin all to yourself while they spend all their time together. But you'll still have to convince them to bunk with you to keep your mom happy.
You move back a few seats sliding into an open spot across the aisle from them. The two of them are chatting while playing with each other's hands. His girlfriend is next to the window which means Jet is facing her. You give them some time, waiting for a break in their conversation, but that isn't really coming. It sounds like when he isn't talking, she is, although he's doing most of the talking right now. His girlfriend notices you but doesn't interrupt Jet, seemingly amused that you're unable or too shy to butt in.