I think I may have read something like this before. If it actually exists something like this, I'm sorry.

The only figure that she could see fell down, the way a tree fell down. And didn't stand up. Then there was noise, shouting but she didn't care. She had to strain the haze that was her sight to be able to see the other figures (however barely), but her internal sight always returned to the fallen figure. Memories, regained only a short while ago, were nagging her brain who wanted just to sleep and leave the problems for later, when she was well-rested and healed.

Yes, she wanted to sleep but something was still on her mind, refusing her the pleasure of sleeping. Her eyes were still open, looking straight at the figure.

Nnoitra.

Slowly she tried to stand up, but then fell on all fours. Deciding that she can go on like this, like an animal, she trudged towards him. Slowly, slowly, she reached him and then wondered what to do.

Her memories of him were confusing. Filled to the brim with pity, hatred and tenderness – what was she to do with them? That older Arrancar, the other her, she was another person with her own thoughts, with her own desires, which no one but her could understand.

As she stood there, contemplating thing and memories, her exhaustion made itself known once again and she was filled with the desire to sleep.

Slowly she crept up, next to him and positioned herself against his chest. It was cold but comfortable.

She fell asleep quickly.

…

There were voices around her, quickly whispered words and almost shouts. They were annoying. Why couldn't they leave her alone to sleep peacefully? Everything would be perfect if it weren't for the voices.

She turned the other way so she didn't have to listen to those talking. She was sleepy.

Then someone was shaking her. Almost growling, she tried to shake off the arm but everything was in vain. In the end she just stopped paying it any attention.

"Nell, Nell," someone was calling her, "Nell, let's go home."

"No. Go 'way," she mumbled, burying herself into his chest even more, "Nell ish home."