Sunny and Hitch- Hitched.

On the dock of a reformed Maretime Bay, Sunny proposes to an emotional Hitch.

He's become a better pony because of her, and wishes to express his gratitude back at the lighthouse.

(Plus some navigation of the law and love when it comes to taking your horse spouse's last name.)

Chinese translation can be found both on fimtale and bilibili translated by Aran214.