After the events of the hostile takeover of rival school from Osaka, Tokyo, and others, and the decimation of all rebel forces who oppose lady ragyo and her life fibers, the world fell into darkness from the overwhelming might of the parasitic life fibers.
Few survivors remain, they would've have died if it weren't for Lady Ragyo sparing them, in return of their undying allegiance towards her. She gave what's remaining of the survivors to her subjects as rewards, for you... I think you got the short end of the stick.
Y/N sits in his room, he was thinking about a girl survivor he met earlier today, she was very pretty and sweet... Better than Nui, his "girlfriend".
"What are you thinking sweetie?".
Nui pouts and gets close to Y/N, clutching her scissor blade, within a split second, she held it against his neck.
"You better not be thinking about that girl, remember who really loves you, me, and only me. Do you understand that, if you don't, I'll kill you... Even if you are dead, I'll still play with you".
"I'm not thinking about her, stop being so crazy... Crap".
Nui smiles and grabs Y/N by the collar, and slams against the wall with inhuman strength. The scissor blade now against his neck, Nui draws closer, to the point where her nose touches his.
"What did you say to me Y/N, remember who's your mistress... Don't have to remind you again?".
"No, don't remind me, I know".
"I don't think you do!".
She pulls her blade back, and slashes his chest with her blade, another slash on his arm, and another on his leg. Nui then smacks him aside, smiling with pure joy.
"Does it hurt?".
"Okay... I understand.. please stop..".
"Good, now go patch up okay".
Y/N gets up sluggishly, and trembles, be staggers out the door, and heads towards the mansion's doctor, where he patched him up. The girl who Y/N was thinking about appears, and comforts him.
"Thanks Jane, I needed a hug from someone not crazy for once".
"I'm here for you".
Jane kisses Y/N, in which Nui saw from afar, her heart ached from sudden pain, and waited for Y/N to return.
He took forever, almost 3 hours with Jane, as he returned back to the room. Nui sat on the bed, sharping her scissor blade. She glares at Y/N, and gets up.
"I saw you with Jane, you kissed her, what else did you do with her!?".
"I'm not telling you, that's my business, and not yours".
"How could you say that to your girlfriend!?".
"Your not my girlfriend, you made me your damn boyfriend, I never even liked you, you sadistic freak of nature!".
Nui's heart broke, and lashes her anger out on Y/N, she destroyed him with pure strength alone. Slamming and turning his body into a living punching bag. As he layed his broken body on the floor, Nui stood over him, crying.
"You should never say that to me!".
She continued to beat him down, lashing all her rage at him. He was reduced to a bloody mess, and layed half conscious.
Several hours passed, Y/N layed on Nui's bed recovering, Nui layed next to him, having playtime. As he opens his eyes, he sees Nui on him, carving something onto his chest.
"Nobody is going to take you away from me Y/N, I'm your girlfriend.. no.. wife!".
"It hurts... stop".
She cared her name on to his chest, along with her initials.
"Your mine only, nobody else".
"Jane... I love Jane".
"I'm sorry, I'm afraid Jane is gone, she had to go away for our relationship to work".
"Don't worry, you have me, and only me, I'm your love, and your plaything".
Nui grabs her scissor blade, and cuts through his clothing with it.
"I wonder if it's possible that a human can breed with a Life Fiber creation, one way to find out".
I'll make a version 2 of the story