Rereading cause I just realised this might be after the timeline of vol.2 Cupid ni Rakurai. It's probably after
Spoiler!
that time Takeo somehow got jealous of Nagata & Ao (technically it wasn't jealousy) that he realised he'd be open to guys too lol.
If this comment is over 2 months old, it indicates that by the time you see this, I would've phrased it more finer by now.
Spoiler!
Do you like to be spoiled that bad?