"It seems that while I was bimbofied, I may have... made some promises to a few students." - Ms. Rack
The Bimbo Teacher route is one of multiple routes in Adventure High.
To access it, you must enslave Ms. Rack at some point and transform her into a bimbo, then have her complete the classes as promised.
Note that this is just a general outline for the route. It is not a walkthrough.
Ms. Rack the Bimbo Teacher
The Protagonist, having enslaved Ms. Rack, attends the second secret notes class during which Ms. Rack is very open about her thoughts, including how she thinks it's gonna be disappointing that it's probably the last time she'll see some students, but also figures it's no big deal.
Heading back to his/her room, the Protagonist reverts Ms. Rack to normal and then head to school to speak to her.
There, she asks to speak to the Protagonist. Should the Protagonist agree to let her speak, she explains she's promised a lot of students some presumably sexual favors in order to help them. Feeling embarrassed about it, but not wanting to back down, the Protagonist can either help her completely, help her partially by promising not to bimbofy her in school anymore but make Ms. Rack keep her promises or just flatout refuse to help her at all.
Should the Protagonist agree to help her completely, Ms. Rack will tell the Protagonist when the first student shows up. The Protagonist promises to show up when this happens.
The First Bimbo Class
The Protagonist returns to Ms. Rack's room and a female student enters. The Protagonist can either agree to help Ms. Rack by enslaving the student, or make Ms. Rack do the lesson.
If the Protagonist enslaves her, Ms. Rack remarks that the Protagonist didn't make her forget anything at all, but the Protagonist explains there's no use for it, as the girl won't be bothered by it, unless the Protagonist orders her to. Ms. Rack, a bit dumbfounded, is still thankful for it being dealt with.
Should the Protagonist make her do the lesson, Ms. Rack will transform into her bimbo form again in order to explain to the student how changing your looks works. The student transforms into Ms. Rack's regular form but soon drops it, exhausting all of her stamina in trying to keep it up. Ms. Rack says it's normal and the student promises to practice it until the next class.
The Second Bimbo Class
During the second bimbo class, the Protagonist returns once more. Ms. Rack explains that this time around, she has promised the student titfucking lessons. If the Protagonist is Dan, he has no issue with helping. If the Protagonist is Rosa, she remarks not having the parts needed for it. If the Protagonist refuses to help, the scene ends.
Ms. Rack fixes this by giving Rosa a temporary cock, which is used for the duration. If Rosa has met with a female Reese at this point and promised to help, Rosa asks if the cock was a real one.
Ms. Rack confirms that it was and Rosa explains that a friend has non-functional parts due to an accident. Ms. Rack suggests you speak to Dr. Tiff instead, but Rosa reasons that if Ms. Rack can make a cock, she should be able to fix Reese as well. Ms. Rack is glad to hear that Rosa is helping people out.
The Third Bimbo Class
Heading back to class once more, Ms. Rack explains that this time, the student wants help... Vocally. Confused, the Protagonist asks for clarification and Ms. Rack explains that the student wishes for help talking like a bimbo.
The student enters once more and Ms. Rack has her speak to the Protagonist, speaking more and more like a bimbo, saying things like "Um" and "totally" in order to further train to become a bimbo.
The Fourth Bimbo Class
Coming back for the fourth class, the Protagonist meets with a girl who wishes to have bigger breasts. Ms. Rack agrees and shows her how to enhance them, but before getting a chance to show how to shrink them again, the girl hurries off. Ms. Rack and the Protagonist worry about her, but decide not to say anything about it.
This comes back to haunt the girl, however...