He Crashed into her life and offered her to see the stars up close. but a tour through time and space with the Doctor often has more to it than one would expect.
(this is the ponyverse Doctor. as such things aren't going to match with he TV show and some things will. this volume is based on the 11th Doctor's run)

After an event yet to be known, DR Junior (son of The Doctor) must learn to live in a world where Ponies are the dominant species, with no way back his only option is to become part of their society and blend in the best way he can but with constant threats occurring left and right and a lonely Princess to watch over from day one, you wonder where he gets the drive from (romance exists partially in final Episodes/Chapters)