Teddy's Links
Logan is Teddy's "friend with benefits," although to be quite honest Logan has the tendency to push all of Teddy's buttons more often than not. There's still an attraction that he can't quite explain or is willing to admit.
"It's complicated" doesn't even begin to describe their relationship. Logan views Teddy as a toy, something to have fun with and something he wants and so he'll have it - but there's more to it than that. He's jealous of Teddy's attentions and gets irate when he returns and Teddy doesn't remember him. There's probably more to this thing than he'd ever admit, honestly.