Disclaimer: I do not own Bleach.
A/N: I'll write a better Nemu X Isane fic some other time...this was written to get a crappy, cliche idea out.
Also, if you remember where Mayuri's sword is located on his body, then one of the sexual jokes here will make more sense...
THUMP
Mayuri Kurotsuchi glanced up from his book, and stared at the ceiling. He had definitely heard a rather loud thump coming from his daughter Nemu's room just now. Instead of checking up on it right away, he waited a few seconds, and then returned to his reading. He simply passed the noise off as Nemu rolling around in bed or something of that nature.
THUMP
Mayuri raised his head again. That thump was much louder than the one before it. He even heard what resembled a moan following the sound. Slamming his book shut, Mayuri got to his feet. He narrowed his eyes suspiciously.
"Nemu?" he called out to his only daughter, "What are you doing up there...?"
There was no reply.
"...Nemu?"
Still nothing.
Mayuri grunted under his breath. "Damn girl...making me actually have to waste my time checking up on her..."
As the mad scientist took his time heading up the stairs, the thumps grew louder, and less far apart. Despite trying his best to appear annoyed, the feeling of parental concern pulling at his heart-strings made Mayuri uneasy. All he wanted was to peek into Nemu's room, make sure she was safe and sound in her bed, and then go back downstairs so he could finish his book. Even if she was rather "expendable", Mayuri still loved her like a real child...sort of.
Drawing closer to Nemu's room, which was marked by a crudely-made sign with her name scribbled on it, Mayuri could hear voices. One of the voices was Nemu's, but the other voice was not easily recognizable to Mayuri. A look of terror spread out on Mayuri's snow-white face; this meant that Nemu had someone up in her room, without getting her father's permission first! Not only that, but judging from all the ruckus, they were doing more than simply talking. Much more.
'Why that little-' All of Mayuri's fatherly compassion for the girl flew out the window in an instant. He wrapped one hand around the hilt of his blade as he charged towards Nemu's bedroom door at a break-neck pace. Snarling, Mayuri raised one sandaled foot and slammed it against the door, sending it crashing to the ground.
"NEMU, HOW DARE YOU BRING A VISITOR INTO OUR HOME WITHOUT-"
Mayuri cut himself off when he realized that Nemu was currently preoccupied having her head in between another woman's legs. The woman she was eating out happened to be Isane Kotetsu, lieutenant of 4th Division and the most esteemed pupil of Retsu Unohana, one of Mayuri's many rivals when it comes to morals. The two Shinigami women were completely nude, their clothes lying in crumbled piles on the floor. The air in the room reeked heavily of sweat and vaginal juices. Mayuri slowly stroked his hand up and down along the edge of his blade's hilt.
"Mmm...butter...butter..." Nemu purred softly, her words dripping with lust.
"Aah..." Isane arched her back slightly, "It's...it's 'cheese', Nemu-san...not butter...you're supposed to say cheese...cheese..."
"Butter...butter...butter..."
A wide, twisted sneer stretched out on Mayuri's lips. "Good, Nemu...very good...keep up the good work...I love you...I love you, Nemu...I love you very much...go deeper...go deeper..." he forget all of his rage towards his daughter pretty quickly.
The next day, Mayuri had hidden cameras installed all around Nemu's room, so as to get every possible angle on tape at the same time...