When oikawa was a child and had a bad dream, he'd crawl out his window to knock on iwaizumi's window.
Iwaizumi then letting him in a few moments later.
He did this so often that iwaizumi just left his window unlocked, so oikawa could come in and sleep with him.
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Haikyuu Headcanons~
FanfictionThis story contains: √Headcanons √Gay √Haikyuu √Random √Crack √Slight Language