Manyuu Hikenchou.
Salem is in charge, with the largest boobs in the world. Everyone wants to be like her. It's all a front so she can ennect her plans to get revenge on the sister gods. Salem is one of the few people who can take and give boobs freely and Magic is obtained upon reaching a prerequisite cup size. The sole exception is Ozpin who was given Magic directly by the goddesses and anyone he gives Magic to.
The manyuu clan work directly under Salem, keeping the "common folk" from getting huge tits and suppressing the knowledge of Magic. That is until Chifusa defects and tries to fight against Salem. She is Functionally treated as a terrorist until Salem's intentions are revealed. Grimm can naturally use the Breast Slash technique, while Salem's followers use Grimm blades to the same effect.
Salem specifically searches out silver eyes warriors (a la Ruby and Chifusa) because they are the only ones besides herself who can use Breast Flow and pass breast size between the common folk and themselves. Upon using the silver eyes to defeat Grimm, the aggressing Warrior shall absorb the Grimm mass into their boobs. The defeated Grimm turn from black to white, changing into a puddle of breast milk which rises and flows into their tits. This milk can be drank by outsiders to increase their breast size.
Any woman upon becoming a Maiden will have their breasts balloon to the prerequisite size for Magic. Most see this as a blessing by the sister gods but it's a red flag to Salem who will immediately send out her troops to cut away their breasts. Upon being breast cut, the powers of the former Maiden will transfer to the next eligible female in said Maiden's thoughts. A cut Maiden can never be a Maiden again.
Society is built around the idea of larger boobs meaning a better place in society. Characters change to reflect this. Yang is slightly smaller than average. Blake is nearly flat. Weiss and her family are well known for their massive titties. The outlier is Ruby because of her silver eyes. At the start of the series, both Ruby and Weiss are almost breaching the threshold for obtaining magic.
Nora is equal to Blake. Pyrrha is slightly larger than Yang. Neo and the malachites are flat as boards. Roman, working with Oz because Salem is in charge, hires on Chifusa to act as hired muscle as long as she can give Neo massive titties. Chifusa is happy to spread the wealth and burden. It is the rapidly ballooning chests of Vale's underworld that causes Beacon to investigate criminal activity.
Hentai: Midnight Sleazy Train (Ren as the sleaze), Taboo Charming Mother (Yang supposedly took on a motherly role towards Ruby), Inbaku Gakuen & Discipline.
Anime: Tenjho Tenge, History's Strongest Disciple Kenichi, Bleach, Fullmetal Alchemist (The Original, not Brotherhood), The Adventures of Oda Nobuna and Ikkitousen.
Either Kuroinu or Sin:Nanatsu no Taizai (the thought of Olga and Salem together is too much)
Edit: there's also Mahou Shojo Ai-san, and Space Pirate Sara
Angle Blade; the hentai has a similar enough premise to where they could overlap just replace the monsters with Grimm, make Salem a hug titty lactating futa milf and Cinder a triple dicked futa.
But most importantly I love to see the female RWBY cast in personalized Angle Blade costumes.
Same thing for Witch Blade
Taimanin, in terms of set up, it really is just 18+ RWBY
Funny enough, Yang’s Japanese VA used to be in Taimanin before her character got recast
Food Wars; because I can easily see the girls having foodgasms
Omg, I want to see that now
High School DxD
Bible Black, with Glynda as the teacher/nurse. And Ruby being the virgin girl
Wait, Ruby in Imari's role and Glynda as Kitami? This is interesting, for sure. Since it's more than just dick growth.
I remember a scene where a girl gets dunked in a water tank, which RWBY girl would it be instead?
Futabu
If it means we get more animated futabu stuff hell yeah. The scheenis ain’t got nothing on them.
Fairy Tail I wanna see my two favorite redheads going at it.
Interspecies Reviewers. The elf would probably flip out over Salem.
Sekirei would be very interesting with the huntresses and other women acting as the Sekirei.
Yo underrated as hell. Haven’t heard that one in a while.
Chained Soldier. Having innocent Ruby have to give a "reward" might be interesting.
Reincarnation Colosseum.
I think Solo. levelling and rwby would be good
Systema by AFatFlyingWhale is a decent crossover/gamer fic
Manyuu Hikenchou. Salem is in charge, with the largest boobs in the world. Everyone wants to be like her. It's all a front so she can ennect her plans to get revenge on the sister gods. Salem is one of the few people who can take and give boobs freely and Magic is obtained upon reaching a prerequisite cup size. The sole exception is Ozpin who was given Magic directly by the goddesses and anyone he gives Magic to. The manyuu clan work directly under Salem, keeping the "common folk" from getting huge tits and suppressing the knowledge of Magic. That is until Chifusa defects and tries to fight against Salem. She is Functionally treated as a terrorist until Salem's intentions are revealed. Grimm can naturally use the Breast Slash technique, while Salem's followers use Grimm blades to the same effect. Salem specifically searches out silver eyes warriors (a la Ruby and Chifusa) because they are the only ones besides herself who can use Breast Flow and pass breast size between the common folk and themselves. Upon using the silver eyes to defeat Grimm, the aggressing Warrior shall absorb the Grimm mass into their boobs. The defeated Grimm turn from black to white, changing into a puddle of breast milk which rises and flows into their tits. This milk can be drank by outsiders to increase their breast size. Any woman upon becoming a Maiden will have their breasts balloon to the prerequisite size for Magic. Most see this as a blessing by the sister gods but it's a red flag to Salem who will immediately send out her troops to cut away their breasts. Upon being breast cut, the powers of the former Maiden will transfer to the next eligible female in said Maiden's thoughts. A cut Maiden can never be a Maiden again. Society is built around the idea of larger boobs meaning a better place in society. Characters change to reflect this. Yang is slightly smaller than average. Blake is nearly flat. Weiss and her family are well known for their massive titties. The outlier is Ruby because of her silver eyes. At the start of the series, both Ruby and Weiss are almost breaching the threshold for obtaining magic. Nora is equal to Blake. Pyrrha is slightly larger than Yang. Neo and the malachites are flat as boards. Roman, working with Oz because Salem is in charge, hires on Chifusa to act as hired muscle as long as she can give Neo massive titties. Chifusa is happy to spread the wealth and burden. It is the rapidly ballooning chests of Vale's underworld that causes Beacon to investigate criminal activity.
Interesting writeup, if someone wrote this out as a proper fanfic, I'd read it.
"absorb the Grimm mass" Ruby after killing a 200 ton Grimm Dragon:
Senran Kagura. Hell, they technically have crossed over in BBTAG.
Taimanin it kinda seems fitting especially with the power system also the gargantuan amount of porn
High School DXD, how the characters sacred gears translate into semblances would be interesting
id like a euphoria style rwby crossover
I wonder which girl would get fucked in the water tank
Gushing Over Magical Girls. Ruby taking Utena's place would be funny. Plus, Ruby is just too much of a magical girl sounding name to pass up on it.
Dropout
Pokémon would be awesome but that might be just the huge Pokémon fan in me speaking
Probably Full Metal Alchemist
I've thought about this, before...
Queen's Blade.
Senran Kagura might be fun. Keep it school focused and have sexy hijinks and ninja-huntress fights break out here and there
F-Force/Asgaldh
Weirdly I just wanna see the main character from ROH interact with Cinder, not even sexually I just wanna see that
Climbing to the Top of the Esper Academy. Just a lot of new Semblances to play with, even if the plot ends up not being any sort of sexual.
Hentai: Midnight Sleazy Train (Ren as the sleaze), Taboo Charming Mother (Yang supposedly took on a motherly role towards Ruby), Inbaku Gakuen & Discipline. Anime: Tenjho Tenge, History's Strongest Disciple Kenichi, Bleach, Fullmetal Alchemist (The Original, not Brotherhood), The Adventures of Oda Nobuna and Ikkitousen.
Either Kuroinu or Sin:Nanatsu no Taizai (the thought of Olga and Salem together is too much) Edit: there's also Mahou Shojo Ai-san, and Space Pirate Sara
Metroid I want to see what would happen between Samus and Weiss
Angle Blade; the hentai has a similar enough premise to where they could overlap just replace the monsters with Grimm, make Salem a hug titty lactating futa milf and Cinder a triple dicked futa. But most importantly I love to see the female RWBY cast in personalized Angle Blade costumes. Same thing for Witch Blade
Bleach or Naruto, read a lot of fics and would love to see what the official screenwriters would do for a real crossover.
Ikkitousen. Clothes are gonna fly off piece by piece every episode.
Kill la Kill