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Rating: 4
A flashback to a few days ago shows Sunae helping the managers daughter with trying out cosplay.
While doing so, she ends up groping her and “teaching her” how to seduce someone by beginning to have lesbian sex with her.
The chapter ends with the MC about to walk in on them, but I’m not sure if it will continue into a threesome next chapter.
Since Sunae has pretty much agreed to marry the MC, I’m giving this the Cheating tag.