I think you're misunderstanding something. There are 2 couples in the raws but the seme and the uke of the second story look really like thr seme and the uke of the first story. So basically there was no cheating, it was just another couple.
You probably need to read about the second couple first
Name: Kowairo ni Somar
Would you mind linking the Raw? (๑╹ω╹๑ )
Omg where are the raws? please... (づ￣ ³￣)づ
Just just the raws........
I was in the uke's side first but now I'm not really.....
So easy..... Seriously....