Did the uke cheated with kido for 2 years after he met the seme?
No.
this story takes place before the events of Pornographer, this is all before Rio met his current partner. no one cheated on anyone. (well kido cheated on his then gf i think but not his now wife and rio didnt cheat on anybody)
Did the uke cheated with kido for 2 years after he met the seme?