You and Iwaizumi are childhood friends, you guys used to play volleyball together as kids with Oikawa. During middle school you have to move to a different states which made him feel sad, after you left, Iwaizumi kept coming to the tree house you both build. As the years go by Iwaizumi met her again Iwaizumi's in 3rd year while you are in 2nd year

Y-you're back? I missed you gremlin.

Iwaizumi blushed as he looks away, his only childhood crush came back from Australia