You can, though he's a little slower to progress than the other two and doesn't seem as fleshed out but the core stuff is there~ (as in you can bang him :p)
Viewing post in The Spirits of Sabil (+18) comments
He's just missing some things that the other two have already. No events, no mini game, no likes/dislikes(ie a favored item), no confession(though Flo doesn't have this either currently), no alternate love making trigger, and most of his dialogue pretty much only tells you about the others and very little about himself.