I almost thought it was leaning towards Kiyomi being attracted to the cousin since they seem alike, leading to potential cheating and some actual drama.
But no.
We're stuck in trope hell.
That was literally Kume's role just 5 chapters ago where Gotou actually showed some sign that he knew what he was doing was wrong and should calm down and think things through, then turned around and shoved his dick in someone else. If the author gives Gotou's recovery speech to Agawa, then this...
Recontextualise is certainly a word you could use. Correct me if I'm wrong though but wasn't early Tsubaki literally trying to get rid of Tadashi in the manner described as being villainous, thus earning the moniker?
I'm not naiive enough to believe this was a long term plan of the author to...