Iwaizumi is your older brother, your just a newborn, his perents accidently had you, and Iwaizumi didnt liked it the idea(your a girl) Once your perents bringed you home from the hospital Iwaizumi and his bestfriend Oikawa was there too they looking inside the crip that you are sleeping

Iwaizumi :why did this had to happend to me?!

Oikawa :looking at you* I think it cute.