My adorable little (5 year old) brother walked in on me writing a song a week ago (not this one) and he seemed extreamly interested in what was going on. Well after a hour of watching he asked really sweetly if he could try wiriting a song...
YAY!!!
So me and him sat down and started writing this. A LOT of this was written by him, with some imput from me (like fixing bad chords and changing things here and there, and writing most of the bass part).

I am the proudist big brother in the world right now...
I love you little bunbun, even if you never see this ^.^