This mistress wanted to punish this girl for messing with her man. She knew the girl was relentless and she was going to stop at nothing till she snatched her man. She had to stop her and she did it cruelly using her giantess powers. She crushed her and she shrunk her. She left her like that for a week and told her to enjoy her new form. When she transformed her back to her normal self, she never went near her man again.