Probably the individual that Washington and Epsilon trust the most on the station now.

Epsi loves his brother and damn well knows he owes him a lot for the things he's done. Including for getting him to Flynn. He's actually extremely worried for the other fragment losing his host, but he's unsure how to help.

Wash... He's not quite so openly affectionate, but he was actually kind of pleased when D made the gesture of helping with the apartment. However, some of Epsilon's feelings are reflected in the host from their long association.