[Mario Bros] Princess Peach and Princess Rosalina are relaxing after a kart race in their jumpsuits. The mature Rosalina takes advantage of Peach's naivete to grope and toy with Peach.
[Mortal Kombat X] Futa Mileena captures her "sister", Kitana, and violently rapes her over a period of weeks, with the help of the horse-like Motaro, until Kitana ends up a completely mind-broken slave.
[Pokemon] Team Rocket steals a device that allows someone to transfer their mind into the body of a pokemon. Jessie makes James test it out, but rather than test it with one of his own pokemon he transfers his mind into Jessie's Arbok... however, she then unkowingly brings him along for some "special training".
[Shantae] Shantae secretly meets the pirate Risky Boots on a secluded island for a round of passionate, angry sex. However, neither of them realize Shantae's friend Sky is watching them the whole time...
[Fallout] A vault dweller gets out of Vault 34, but very quickly she comes in contact with radioactive material that causes her to mutate, growing larger and curvier, as well as growing a large futa cock. The rest of the short story would be quick vignettes showing the sexual adventures she has in the wastes.
[DC Comics] Catwoman finds herself living with Harley Quinn and Poison Ivy, though she's caught off guard when he finds the two of them in a lesbian relationship, which they quickly rope her into.
[original] A ditzy blonde mother is tricked by her shota-looking son into having sex with him, by making her think it's all just a form of Sex Ed.
[Mario Bros.] Peach and Daisy find a special mushroom that makes their tits grow and feel extra sensitive. They then go on a journey, offering sexual favors in trade as they search for more breast-growth mushrooms.
[DOA] Futa-Kasumi and Ayane are having a fight, but Kasumi can't focus because of her intense erection. Ayane takes advantage of the situation to toy with Kasumi's big cock, and eventually Kasumi ends up nipple-fucking Ayane, causing Ayane's breasts to grow massive from Kasumi's cum.
[X-Men] Mystique discovers a new technique that allows her to split into two bodies. She takes advantage of the situation to morph into different futa versions of Marvel women and have a one-woman orgy
[Futurama] Leela and Amy travel to planet Amazonia on a delivery, but they don't realize they're arriving during a futa Snu-Snu ceremony and find themselves as the preferred mates for the Amazon women.
[Steven Universe] Amethyst convinces Peridot to relax and play together with their shapeshifting abilities, which quickly turns erotic.
[Undertale] Alphys creates a potion that accidentally causes her to grow a cock, and Undyne instinctively assumes that sex will cause it to go away. However, their fooling around creates a mess for Toriel, who joins in to punish the girls.
[Universal Monsters] Dr. Frankenstein attaches a fresh cock to his "daughter", a female verison of the monster. She then goes to try out her new organ with all the other female versions of the classic monsters.
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