Disclaimer: Not mine
Rating: PG-13
Pairing: Ulquiorra, IchiGrimm
Author's note: English is my second language so please don't kill me over grammar mistakes and all those things. Still un-betaed.
Thanks: To misumisu who prompted me. But somehow the prompt 'collar' went its own way… Well, I hope you'll still like it.

ELEMENTARY, MY DEAR WATSON

Ulquiorra Schiffer, fourth Espada and Aizen's most loyal arrancar was baffled.

That day Grimmjow Jeagerjaques, Las Noches' resident anarchist, had agreed with him. And it wasn't an 'I agree with you that this tea tastes like shit' , not that he'd ever tell Aizen-sama that, but an 'I agree that everyone should patrol their territory and not go searching for opponents to kill'.

The green eyed man wondered for a moment if Sexta hadn't been abducted by Soul Society and had been replaced with one of their Mod Souls. The man had taken up the habit of whistling while scouting! He had tried going to Aizen-sama, telling him that this conduct was too out of character for someone like Grimmjow but the shinigami just waved his hand with disinterest.

Obviously his Lord didn't understand the many perils that an happy panther could cause. He was problematic enough when he was still his aggressive self but at least everyone knew what to expect of him.

Ulquiorra Schiffer decided to investigate.

In his one week long observation of Sexta's behaviour he noticed that the man slipped out of Las Noches during night time on Friday and Saturday, a short burst of reiatsu alerting him that the other Espada had opened a Garganta to the human world. Ulquiorra never followed him but he knew that he had to if he wanted to know the reason behind Grimmjow's change.

The next Friday he took only his sword and a magnifying glass with him and opened up a passage right after Grimmjow. He wasn't sure about the glass but during the woman's detainment she told him that the correct way to investigate something was with a magnifying glass and a tobacco pipe. Ulquiorra wasn't sure about the pipe either but since he didn't have one it wasn't a problem. If he needed to make smoke he could use a spell.

Cuatro was not surprised when he ended up in Karakura. That town was always involved, in one way or another.

He searched for his fellow arrancar's reiatsu. It was faint because the other had tried to mask it but it was still perceivable to his fine senses. The other thing Ulquiorra noticed was that there was another energy near Grimmjow's. A familiar one.

The green eyed man had to restrain a groan when he identified the reiatsu as Kurosaki Ichigo's. And here he thought that the blue haired man had changed.

However the two weak energies weren't clashing against each other, they were actually… Ulquiorra re-checked just in case, his really fine senses could always play tricks, couldn't they? It almost seemed as if the two reiatsu were blending.

The brunet quickly moved near the shinigami's house. The two seemed to be inside a room on the first floor, lights off and window open.

Ulquiorra's eye threatened to pop out on its own without his hand's help as he watched Sexta on the floor, naked save from a studded cerulean collar. He was on all four and was being thoroughly pounded by the orange haired brat that Aizen-sama seemed to find so interesting. At the present time Ulquiorra found him interesting too.

The panther seemed to enjoy the umiliation. Kind of strange if you thought that when Cuatro insulted him he bristled and huffed. The fourth Espada had half a mind to tell Aizen-sama about Grimmjow's little escapades with the shinigami boy but then he paused. It was so easy to live in Las Noches without the panther's brash actions and his insubordinate manners and of course Ulquiorra didn't care about the fact that his 'brother' seemed to like being restrained and penetrated.

He thought about how Grimmjow looked at his lover, full of lust and trust. Maybe the next time he fought the shinigami boy he could go a bit easier on him. But only a tiny bit.

A/N: I don't know what exactly is this but I posted it all the same. I have smelly stuff in my hair and a fire to stoke so please don't kill me. Ulquiorra might become an IchiGrimm supporter, I think. XD