No idea about how the author plans to tie this mess, but at least gotta give him credit for originality. Not sure if it's the first time I see a swinging manga incorporating a third couple, instead of going with the usual full netorare or complete partner switch routes.
Well, the author really did go full retard. And he didn't even bother building up to this. They just suddenly start acting out of character. What a shame.
Base +6, PowerSlacker +7, mm223456789 +22, MelmothTheWanderer -14, evaluv3r999 +4