Transmigrate to Another World and Become a Beautiful Girl's Mount

Come join me and become a hero of justice beneath a beautiful girl's feet! Saving the world should, of course, start with letting a beautiful girl ride you.

After transmigrating to another world, the protagonist unexpectedly becomes a member of the dragon race, and one of its highest-ranking Holy Dragons at that. After training hard, he hopes to become a hero who saves the world, but through a twist of fate, he becomes the mount of a beautiful girl dragon knight. Together, they set out on a journey to save the world.