Just a quick little idea I had. It's set just after the Past Arc. Enjoy!
He should have known the day would come when he'd be asked this question…
It was a normal day in Soul Society. The fifth division was quickly recovering from the loss of Captain Hirako, and were being guided sufficiently by their vice-captain. The squad had also lost their third-seat due to suspicious circumstances, but there were rumours he was to be replaced by the silver-haired child prodigy Gin Ichimaru.
The prodigy in question, at that moment, was sitting on – not at, but on – a desk lazily, watching his vice-captain fill out pile upon pile of paperwork. He sat swinging his legs, pondering a question that had been bothering him for quite a while.
"Aizen fuku-taichou," he began. "I have a question…"
"Is it 'May I help with the paperwork'?" asked Aizen, not looking up from the form he was filling out.
"Nah, I wouldn' be much use – my handwriting's terrible."
Aizen sighed. "Go on then. What did you want to ask me?" He sat back in his chair and sipped his tea, awaiting the child's question. He expected it to be a question to do with killing something – recently, Gin had an obsession with asking questions along the lines of 'Would our fourth-seat die if I hid doggie treats in his pockets and then let a rabid dog loose in his quarters' or 'Would our fourth-seat die if I chocked him with a metre-long piece of spaghetti?' Aizen had a feeling that Gin was indeed capable of performing such outlandish things, and was getting rather worried for his fourth-seat, taking extra precautions to make sure the poor unsuspecting shinigami never crossed paths with Gin.
Aizen took another long sip from his cup, as Gin pulled as serious a face as he could muster, and asked:
"Aizen fuku-taichou, where do babies come from?"
Aizen almost chocked on his tea.