He woke up with water filling his nose. For a breathless second there was a rush of panic. Then Izaya was coughing and spitting out water, the lingering headache expanding against his skull like something vicious inside his mind. He supported himself against the tub's rim, eyes closed and took deep slow breaths. Izaya was sure that he had hurt Shizuo, it had given him a temporary satisfaction that his one night stand had completely lacked, but all too soon he was back to feeling annoyed.
More, he felt very depressed. The hot water made him feel borderline feverish. Izaya dragged himself from the tub and wrapped his naked body in a robe. His mind was completely empty.
In bed he simply flung himself on his belly and slowly turned over until he was lying on his back. His anger abated, replaced by confusion. He simply did not have the faintest idea of what to do. Izaya sighed under his breath, very quietly. The bed seemed absurdly large as if it contained the whole world on which he was left floundering and at a loss. Out of instinct he reached for Shizuo and did not even find the phantom shape of his body.
Izaya was impossibly tired but sleep would not return. He stared at the ceiling and tried to convince himself that he did not miss being cradled in Shizuo's arms. Izaya had to quiet his irritability and the best way to do this was to seek some sort of relief. He ended up masturbating. Eyes closed, hunting for some random fantasy. He tried to think of faceless women, breasts, slim hips, small shapely asses but he still ended up coming with Shizuo's name on his lips.
"Shit. Shit, shit, shit."
But at least his exhaustion collapsed on itself and pulled down under to a dreamless sleep.

Shizuo had always been aware of a certain mismatch in their relationship. It was something that he could push aside normally and Izaya had a way of being breezy about it. But with time Shizuo's issues increased and became an obstacle even as he became conscious that for better and for worse he did love Izaya.
Now, after a hard day's work he was ready to go home and chew some tasteless cardboard meal. His day was about done but clearly Izaya's was only beginning. Shizuo hated whenever his job took him to pleasure districts and much more so now. Across the street Izaya was strolling to a high end restaurant, one girl on each arm and a third one tagging along.
Shizuo wanted to drop a vending machine on the four of them. Rumors had reached him that Izaya was burning the nights away on women. Many of these, in fact. Never repeating the same one twice. He rotated the best clubs in the city and fancy places of all sorts. Hotels, champagne and caviar. To go with the orgies. From what Shizuo had heard they were not professional girls. Shizuo was not at all surprised. He knew that Izaya was highly attractive to women as it was. Izaya could be sleek, smooth and he mastered the lingo perfectly. All he needed was to snap his fingers and droves would jump into his bed eagerly.
Shizuo turned his back to the group, the sound of laughter and of high heels hitting the pavement was akin to nails on chalk, and walked away rapidly. He committed the grave mistake of looking over his shoulder only to see Izaya kissing one of the girls deeply. Shizuo kicked a garbage can. It crashed with a loud bang and the girls jumped and shrieked. Izaya smiled viciously and waved at Shizuo, slowly. The rings sparkled in the neon light, red, blue and purple. It took all that Shizuo had to simply walk away.
If the girls around Izaya were not star struck they might have noticed that his heart was not in it. There was nothing accidental in this meeting with Shizuo. Izaya coordinated his schedule just for the purpose. Once he accomplished this he lost all interest in the empty chatter. Or in anything for that matter.

"So…what happened, exactly? Trouble in paradise?"
Shizuo did not answer. He knew that Shinra meant well but he was not in the mood for talking about it.
"Something like that."
"Did you guys fight? He's with a new girl every night. More than one at the time, even! It's weird."
"Izaya was bi to start with so it's not all that weird."
"Shizuo…he's your boyfriend, somehow. Aren't you being a bit too calm about this?"