Today, Celestia learned a valuable lesson about friendship.
Wait, friendship? No, what I meant to say was Newton's Law of Gravitation. That, and little siblings will ALWAYS fuck up your vacation plans.

Original comic can be found here: http://dori-to.deviantart.com/art/Tidal-Revenge-342876551

Celestia was played by Gina M: https://www.youtube.com/channel/UC6T3LYoTq8ERekrcWoCWHMw