Touchy-feely? I take it that you meant Basch. The only people that I recall him having skin contact with was Ashe, Vaan, Reks and Noah.

Just me, but within the context of the game, I don't see Vaan as being romantically interested in anyone, perhaps, because he still seemed really innocent in this matters ;) Probably another few years, once he actually realized that Penelo is a girl.