Not ex crush but just someone he played with
I know but i would like to think that that's what keichi thinks so he would be super jealous :> EHEHEHEHEHE (evil laugh~ )
Also i like the idea of a top shingo so i wouldn't be annoyed if there was some hot scenes in the other manga with shingo and this calico cat ( forgot his name in the other manga but you all know it )
I wouldn't mind that either(〜￣△￣)〜
In the future rio will find his own cat I'm sure he will find his own love and keichi needs to manage his jealousy I bet he will be extremely pissed off when he find out that the cat is actually Shingo ex crush can't wait for it :P