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Possible targets:
Blakes Books: turn from softcore erotica to hardcore porn ranging from bimbofication, futanari on female, harems, genderbender, mind control, instant loss, public sex, reality alteration, 1nc3st, etc. Blake basically has kinks for every single aspect of Ruby (and the Cock Curse). Seeing Ruby masturbate or have sex is a major turn on rather than disgusting. And even if Ruby tried to discuss the Curse as a hypothetical problem, Blake would just think that Ruby wanted to do sexy roleplay with her.
Clothes: The girl in question enjoys wearing some form of slutwear as a personal choice of style. Weiss for example may rationalize it as rebelling against her father controlling her. Blake might insist that it’s the normal style of Menagerie. And Yang might remember it helping to motivate Ruby to train with her and ended up really liking it herself.
Uniforms: Becon’s female uniforms all become akin to skimpy Catholic uniforms or sailor fukus with the idea being that Aura provides all the protection you need.
Weapons: Could be that their weapons become mofe erotic; Crescent Rose gains a stripper pole mode that works with Ruby’s speed to let her become a stationary whirlwind for area denial. Myrtenaster has an alternate “dildo mode” where the blade retracts and some of the Dust is rerouted to the phallic hilt to provide extra heat, cold, electrostimulation, force/momentum (Black), hard-light ribs, etc. Gambol Shroud can use Black Dust along it’s cable to stick to a target, making it perfect for entangling and restraining enemies for easy dispatching or for shibari bondage. Ember Celica has soft gel handpads that are utilized with much smaller Dust pellets that activate alternating pistons to provide a mechanically optimized handjob for her sister (they are also be used as a potent pair of vibrators).
Beds: The beds combine into a singular, very comfortable, bed that the whole team has been sharing since they became a team.
Homework/Textbooks: Depends on the class. Grimm Studies could turn Grimm into sexy monstergirls/monsterfuta. Another class might teach students to enter a mindless bimbo state in order to hide from Grimm. A class about Dust might somehow alter or add to their elemental attributes; Red passion, Black goth/punk, etc. (not sure how this would work really) History fundamentally changes the relationship between Humans and Faunus so that Blake becomes the teams sex slave?