WHAT THE ACTAL FUCK, I DIDN'T KNOW SO MANY PPL WOULD READ THIS

Oikawa Tooru was always known to the public as someone without a younger sibling. What if, by happenstance, he had a younger sibling? What if they started to fall in love with someone on the Aoba Johsai team? Contains: Spoilers, Iwaoi ( ͡° ͜ʖ ͡°), and others that I have not come up with yet that I will add later.