Background Pony #13BF

"There is no relationship of a mortal pony with an immortal creature that can live more than a thousand years"But you are wrong. It doesn't need to be friendship. Rose Quarts from Steven Universe was over 5000 years old and older than civilized mankind and she still fell for a 25 year old guy to make Steven. Samurai Jack had a romance with a girl who was 100 year younger than him. Doctor Who is an immortal time traveler and had a romance with Rose who was a normal human. Disney's mythological Hercules was a son of an immortal god Zeus and a normal mortal woman. In anime Spice and Wolf, an actual female wolf goddess who is over 600 years old fall in love with some 26 year old merchant. This isn't something weird. It's not happening often because not all fictional stories are about immortality but it does happen often and it's never controversial. You just have some weird bias against it and that's why nobody agrees with you while majority of fandom like this idea. They want Fluttershy to be happy and not some sad folk on the internet who want immortal character to be forever single.