You and Oikawa have been friend since kindergarten. He likes to tease others a lot and Iwaizumi gets annoyed. One day Oikawa and Iwaizumi were on their surron e-bikes and Oikawa was watching his little nephew Takeru at a little outside pop up mall. It was a beautiful day and Oikawa was trying to flirt with girls but they thought Yakeru was his son

Oikawa: Iwa-Chan my charms don’t seem to be working… he said while sulking

Iwaizumi: It’s because they think he’s your son can’t you read a room shitty-kawa?

Takeru was silently watching munching on his milk bread