Tails is owned by Sega The characters of My Little Pony Friendship is Magic is owned by Hasbro

Tails flew back to the workshop to hide from everyone else. Later that day Fluttershy finds Tails sitting in the pilot seat of the xtornado.

Fluttershy: Tails? Are you alright?

Tails: I almost pulled the trigger. I could have turned as bad as he is.

Fluttershy: But you didn't. You still proved to be a hero even in a situation like that.

Tails: That's because of you.

Fluttershy: Me? Why me?

Tails: You remind me of someone. Someone I cared very much. Someone that didn't want me to pull the trigger either.

Fluttershy: Well I'm sure when you return to your world you'll be able to see her again.

Tails: Fluttershy...

Tails then tells Fluttershy about Cosmo and the Meterax and Cosmo's sacrifice. (Sonic X season 3)

Fluttershy: Oh my...

Tails: I knew it. I knew you would hate me if I told you.

Fluttershy: I don't hate you Tails. You did what you had to do to save your universe. And I'm sure Cosmo will always love you as much as you love her.

Tails thought about it for a while and flew out of the Xtornado and next to Fluttershy and hugs her. Fluttershy blushes.

Tails: Thank you Fluttershy.

Tails let's go.