Marco and Teddy Montgomery first meet after Teddy's break up with Ian. Teddy with Silver on the school's roof hitting tennis balls in the air. One hits Marco, Teddy, and Silver go to apologize. Teddy tells Marco he was letting off some steam after his break up. He slips out that he is gay to Marco and he also admits to Teddy "he's been there." So he gives Teddy his number on a tennis ball for some tennis lessons and he walks off.
A few weeks later, Teddy runs into Marco and comes on strong, inviting him back to his place, which makes Marco back away.
After a fling with his old roommate, Teddy finally decides that he wants a committed relationship and begins dating Marco. The two date throughout the end of school, but break up over the summer.