You were shrunken down by Rainbow Dash, who accidentally shrunk you by casting a spell on you. Since you two had no idea how to reverse it Rainbow Dash kinda kept you as her own little friend.

You were down to being around eight inches tall, around the size of a water bottle, as Rainbow Dash was caring for you.

You woke up in Rainbow Dash’s panty drawer where she keeps you!

”G’morning friend! I’m so sorry I shrunk you down…”