@obsidianpassion I mean, in the case of her Sakuya, he directly admitted to having an NTR fetish. If anything, she's a great GF for indulging the dude.
and for Amane, she just gave her a choice. An odd choice most people would turn down and even resent her for suggesting, Amane was the one who decided to act on it.
It's really just been Susa getting caught up in the moment in the worst times. Times planned by Miko to begin with. TBH Susa this time coulda just explained the situation and Saku woulda gotten off on it, but I guess Susa's entire bloodflow was in his magnum dong at the time.
@vannn didn't get that at all tbh. Susa's just conflicted between a lingering crush and his stable current life, and Miko is taking full advatadge of that.