Corrupting koneko (real)
As shiro makes a plan to capture one of the peerage members he bumps into a small girl with white hair "sorry" he bows as the girl nods and walks off "bingo" as he bumped into her he felt a devils aura meaning she's part of the red heads peerage "now for the plan" as he continues his day as normal,having sex with the kendo club, he started to ask murayama about the small white haired girl "her names koneko toujou and she's part of rias's occult research club" he smirks "your gonna corrupt her?" He nods "she'll be useful for my plans" she smiles "she'll soon be a sex slave" he shakes his head "she's a nekomata" he chuckles "she'll be my pet instead" she laughs "this will be fun to watch" he then waited for the school to end.
As he was on the roofs he saw koneko walking alone back home "now for the plan" a green slime attacks koneko "I did a little something from the familiar forest" as he was wondering how to catch koneko without suspicion he found out a familiar that was a slime that could melt clothes off and do his bidding "this will be an interesting moment to watch" as koneko try's to fight it she only got pinned down and dragged through an alley way and knocked out "well done my familiar" the familiar had koneko inside it but made sure her head was sticking out to have oxygen in her lungs "now let's take her back" a black goo surrounded them and cause them to disappear.
After a few hours koneko opens her eyes only to be pinned on the wall with the slime wrapping her arms and legs "its useless to escape" shiro shows himself from the shadows "YOU!?" Koneko was filled with rage "as you can tell this slime is from the familiar forest" he laughs "I also gave it a few more things to make it powerful and magic resistant, so your unable to break free" as she try's she felt her mana getting drained "and if you do try it'll weaken you" a white goo appears in his hands "as you can see I'm not human,devil,fallen nor and angel" he smirks "I'm the god of corruption" koneko eyes widen "gods!" He nods "I'm his brother" the slime penetrates her mouth and a liquid is coming from the slime is making her drink it "the slime is making you drink a special aphrodisiac" he chuckles "I know what you are and I can't wait for you to become an obedient pet" he leaves the room.
A few days passed and shiro managed to trick the school into thinking she was really sick and couldn't have anyone see her at the moment.
As he enters back in the room he sees koneko naked with the slime penetrating her ass and pussy and her eyes were filled with hearts "i see she became more cooperative" as he summons back the white goo he smiles "let her go" the slime slowly puts her down "koneko do you accept to be my loyal pet and take every order I give" koneko nods "then come here" as she hugs him he makes out with her as the white go latches onto her and fills her whole body "now show me your true form" she becomes a nekomata with ears and two tails as a cat "good girl" the corruption then makes her breasts large and her thighs thicker as a collar appears around her neck "your now mine" as he pulls the chain in her collar he throws her onto the bed "take me master!" She opens her arms "make this pet full of your semen, show me im yours" he then penetrates her pussy with his cock as he begins to thrust "Nya!" Her cute moans and their love making went on for hours.
Koneko had white latex in her body but her ears and tail had latex on them and her breasts were free with white Hearts covering the nipples and a short skirt with nothing covering her ass and pussy and had arm and leg warmers with a collar with a black glowing heart and he eyes were purple and on her chest had a cat head wrapped with tentacles.
They fucked for two days straight with no rest but after that they went back to their normal routine and asked koneko to be her corrupted form when she's at his home or their alone and she agrees to his order.