I think he mentions he's straight in a route, however it would've been cool ;w;
I also believe there's a missable piece of dialogue that slightly suggests Travis would actually say no if you asked him to stay at his room. At least that's my interpretation.
Travis would say no because he wants you to stay with Mikko, duh.
So are the spaghetti until they get wet.
Also he's really into getting Mikko and Arvo back together. I think the tanuki boy is a fudanshi.