
yep, the where. At that time shinobu was incertain about junsuke, because of his past, so he played around, but by doing so, he realized that he realy wanted jun.
wel.. that's what i got from that at least.

well I don't mean Junsuke was a real lover for Shinobu, I believe Shinobu took their relationship serious after when Shinobu stepmother came and what happened after that.
In the beging he said to Kimura when Kimura asked him if he has someone like boyfriend '' of course I do, but not only one ''.
and Shinobu even discrim him in the beging as '' We've lived together for 2 years already, he was a kouhai from my days as a gigolo''
Shinobu never talked about Junsuke as LOVER, I think they slept together, but Shinobu was afraid to love someone and be in real relationship, so Junsuke wasn't a LOVER for him in this time when he slept with other. (u can see Junsuke asked him in ch.2 page 25, if he gonna be in serious relationship with him)
After that stepmother came and they have a little fight? (idk what should I call it), they made it and became real lover. So I wouldn't say he cheated.
After all this time, what i didn't understand is, at the beginning when Shinobu slept with Motoharu, he was already in a relationship with Junsuke or not yet?...