Here's the plot of the challenge:
While doing some training alone in the bat cave, a 12-13 year old Robin (whether is Dick Grayson or Tim Drake is up to you) accidentally knocks over a table with chemicals from Poison Ivy that Batman was experimenting with, causing one of the chemicals to fall on him. The chemical causes him to become unconscious for a while.
When he wakes up, he's called by Batman, who tells him that the Joker and his gang are robbing one of the banks from Gotham City. As they get there, the Joker and his gang members (which includes Harley Quinn) split up while trying to escape, making Batman having to go after the Joker, Batgirl (who came along with them) having to go after the gang members and Robin having to go after Harley Quinn.
During his fight with Harley, she accidentally pulls Robin's pants down, revealing that the chemicals that spilled on Robin earlier caused his penis to grow from 5 inches to 18 inches long. He's at first embarrassed, but then he notices that Harley is staring at his dick with a lustful gaze. Robin then makes a deal with her: she renders herself to him and goes to prison, and he will fuck her. She quickly agrees and they proceed to have sex.
The story then follows him having sexual encounters with the following Batman villians:
Catwoman
Poison Ivy
Talia al Ghul
The Ventriloquist (Peyton Riley)
Nyssa Raatko
Amba Kadiri
Fright
Harpy
Lady Vic
Madame Zodiac
Magpie
Nocturna
Roxy Rocket
Lark
Sylph
Ruby Ryder
Here's the requeriments for the story:
Subplot for the fic: Batman never finds out about Robin's encounters. However, Batgirl (who has 32G/FF-cup breasts) slowly get suspicious and starts investigating. When she finds out, she confronts Robin about it. She says she won't tell Batman... if Robin fucks her as well. Not only her but Supergirl (who has L/JJJ-cup breasts) and Wonder Girl (who has 34F/DDD-cup breasts) as well. The fic ends with Robin having a foursome with the girls.
Each villian has the same size of breasts as the following adult models:
Harley Quinn: Maxi Mounds
Catwoman: Penelop Black Diamond
Poison Ivy: Teddi Barrett
Talia al Ghul: Chelsea Chams
The Ventriloquist (Peyton Riley): Beshine
Nyssa Raatko: Casey James
Amba Kadiri: Minka
Fright: Kayla Kleevage
Harpy: Sarenna Lee
Lady Vic: Crystal Storm
Madame Zodiac: Mistress Rhiannon
Magpie: Lolo Ferrari
Nocturna: Amy Anderssen
Roxy Rocket: Mandy Mountjoy
Lark: Cindy Fulsom
Sylph: Zena Fulsom
Ruby Ryder: Melonie Tipps
NO pegging, no watersports, no scat, no heavy bdsm, no futa, no pregnant sex.
If anyone decides to do this challenge, thank you. I look forward to reading.
Thanks to anyone who decides to do this challenge.