Lucerys Velaryon is born a girl and things become a bit more complicated, especially when Aemond starts taking an interest in his niece.
Some things will be the same as in the TV show, but the timeline will be a bit different.
Baelon Targaryen broke his younger sister's heart, making her run away to the Vale. Baelon left to travel the free cities. Years later they are brought back together and things get a bit complicated. Baelon makes some realizations, but Alyssa might not be as sweet and docile as she had once been.
This story is part of the Deirys Targaryen universe.