If anyone can help me remember the name of one of the mangas that went missing from the school, it would be much appreciated.

The story was about a teacher I believe who was a lesbian, and for her lovers birthday she wanted to grow a penis as a gift for her lover (strange I know). So she goes to the schools head of the black magic club, and he says he needs to have sex with her 100 times before she can grow a penis.

Does this ring a bell with anyone?

Thank you again for any help with the matter, I've been looking all over the site for it.