Shampoo

No one other then Shampoo had noticed the paper fly out of the old pervert after getting beaten by her airen again. Hiding it, she went back to her great-grandmother to show her. It took a few hours and the old woman had made sure to turn Mousse into duck before knocking him out to get him out of the way.

"It is quite fortunate that you found this. It is a magical paper which contains a debt that the old fool had to pay. But it looks like he missed the part were his entire school would have to help pay it off as well. The magical paper making sure that they're compelled to obey until it is paid off, as stated by the holder of the paper.

This means we can compel not only your husband but the two families to agree with your marriage. The only one who might not be affected is Ranma's mother. It still might depending on how Happi thinks of his school. And if she's not affected, there are other methods to convince her."

"Airen will really marry Shampoo?"

"Not only that, but the magic will allow mental and physical changes. Simply by using the paper, we can remove his curse, his fear of cats, and make him love you. I can think of a number of says to use this."