Princess Celestia was horny.
She was pleasantly surprised to see Barack Obama waiting in her bedchamber today. He had returned from his human world after several years of absence.
"My two terms are done. I don't have to lead a country anymore. Now I can spend all my time here with you, my beloved princess. I can offer you the love and happiness you deserve, whenever you want."
Princess Celestia panicked. She wasn't ready for a full-time, short-distance relationship.
"Um, are you looking for a place to stay? I believe there's some homes available in Ponyville," said Princess Celestia. "It's close enough that I can fly over and visit you when I get some free time. What do you say?"