I remember being able to tell Val to bimbofy most of the main cast after completing the NG+ for bimbofication. I haven't been able to recreate this, and was wondering if it was removed from the game. Any insights would be great, thanks

Edit: Solved, thanks a bunch!

Posting this for anyone who has trouble in the future:

After completing the Bimbo World, start it up again. When you come to the scene where Val is about to transform Ms. Rack into a bimbo, choose to interfere. Doing so causes Val to make Ms. Rack give Dan a tit fuck while she runs off, completely naked.

Both Val and Ms. Rack are now stuck in their Bimbo personalities and cannot change back without starting a NG+.

Heading into the streets causes a short scene in which Val briefly turns Sarah into a bimbo for an hour.

After seeing this scene, head into the item shop and you'll see Molly get transformed into a bimbo, before Val runs off. Speak to Molly and she'll suggest you visit Dr. Tiff. 

Heading to the school, another scene plays out. This time, Val - wearing clothes - transforms Cassandra into a bimbo. Yeah. The one who boasts about her magical defense is transformed into a bimbo. That... can not be good for your health. I think. Val says that Jane wants to meet you, but Molly said that Dr. Tiff wanted to meet with you... Let's go with Molly's suggestion first.

Head to Dr. Tiff's room and speak to her. Dr. Tiff will remark that you're off somehow, but the protagonist will claim s/he is fine. Dr. Tiff tells you to shut up so you better just be silent and obey. After you're done, head to Jane's room. Now, Jane's room has two routes depending on what you did.

If you never visited Dr. Tiff, Jane will hypnotize you (no, I don't know if she has a spell for that) in order to let your guard down.  If you did get Dr. Tiff's help, the protagonist won't get hypnotized by Jane and instead confront her, asking what the hell is going on. Jane will explain that she saw Val nude and thought... well, that's not very good. So, she gave some of Val's intelligence back, causing a massive backfire, where Val randomly runs around and transform any woman she sees into a bimbo. Now, you have two options. The first is heading to the library and the other is heading straight to the dungeon.

If you head into the library, you'll find a note left by Julia, who says she headed to the first floor of the dungeon and headed east. If you fixed Ashley, the note will mention that Ashley is with Julia, too. Oddly enough, there's a kiss mark at the bottom with the word "Thankies" written. The protagonist remarks that s/he didn't think that Julia used lipstick..Heading to the first floor of the dungeon, you'll run into Val, who is riding around on Dr. Tiff, with Ashley and Julia both being nearby. All four women are completely nude and Val is about to snap her fingers, presumably to transform someone else (read: you) into a bimbo. Remember that I said you should go meet with Dr. Tiff earlier? Yeah. This is the exact reason why:

If you got help from Dr. Tiff, you'll be given two options: Yes and No. If you didn't get her help, both options simply say Yes.

When given the option, choose "No". Val, surprised, will be confronted and you'll be presented by another option. Either allow her to bimbofy safely or deny her bimbofication privileges at all. Choose the former for an affection boost and then finally head back to the Protagonist's room. There, Ms. Rack (who will still be a bimbo) will say she likes being a bimbo... before changing back. If you want her to remain your slave, make sure to assert dominance. Otherwise, she'll fuck right off and you can't re-enslave her (might be possible with the Book? - someone feel free to confirm this for me).

Regardless, Val will remain your slave and you're free to change her into any form you please. However, if you change her into a bimbo again...