After I Transmigrated, I Got Together with My Brother's Godfather

Severus Snape pairing. Original character warning. The golden finger is extremely powerful, and all characterizations are my own!

Lin Qingwu is a snake on the verge of becoming a dragon. The energy on Blue Star isn't enough for her to ascend, so the Heavenly Dao grants her wish and sends her to the world she wants to visit. However, due to the Heavenly Dao's restrictions, she can't change the original timeline and must wait for Harry Potter to kill Voldemort. Still, she does her best to change many people's fates and save those destined to die.

She arrives in the magical world at the wrong time, so her soul transmigrates through time to accompany and save Severus Snape. Little Severus Snape now has a fairy sister of his own.

A little princess is born into the Malfoy family, which has had only one child per generation, and Severus Snape finally gets to meet his very own little rose.

Draco is always jealous of his godfather. Why does his sister Su Ruisi cling to him whenever his godfather visits Malfoy Manor?