Just rip the chair open, like c'mon man, I know your views of romance are a little twisted, but still. I mean, at least he was outright by saying, "hey, I'm just gonna be chilling in this chair" instead of giving her hints and letting her figure it out on her own.
Damn if that was me, I'd tell him to gtfo out the chair, lets date or whatever just dont be creepy and fuckin burn that chair.