He's interested in Lisa.

"Well, that was the other reason I wanted to talk to you. That Asian chick you came in with is smokin' hot, and you know how I like Asian chicks. You think there's any chance I could get to spend some time with her while she's in town?"

Trevor very rarely asks for favors from you, and he's helped you out a hundred times without asking for anything in return. But Lisa definitely wants to jump your bones. Asking her if she's interested in Trevor might be a slap in the face.

This might be a delicate situation, with a tough decision to make.