This: banging the junior NTR bull is the go to idea behind many NTR heavy games.
The cheating wife is there to dissolve all there was that resembled a family to Xio.
As a side effect of such NTR heavy well travelled path, MC and the players behing him, they all
feel a deep devouring sense of betrayal, despair, desilusion and anger, on top jealousy
for the NTR bull who gets a house and a girl of whom Xio and MC thought the world of,
suddenly, totally undeserving and cheaply, she gets dropped by plot/dev ex makina
straight down his ”pants” with that girl being the instigator,
on top of a sexual scandal to cost her her job and all her livelyhood,
as being the boss and effectively treating your juniors, soliciting and then doing the dirty with them while supposedly on the job is the mother of all sex harassment lawsuit where the NTR bull would get everything she ever had.
All NTR instigators, either the cheating floozie or the bull are hated. That is the trope.