Witch Trainer: Episode 21

In this chapter, Cho gets so used to stripping before the Headmaster that she even invites Hermione to take part in the show, gloating at the young witch's perverted reaction. Meanwhile, Hermione's own training resumes as "Professor Dumbledore" manipulates her into letting him get her off with his fingers... while Luna proceeds to do the same with no signs of reluctance whatsoever.