Short story, not contracted
The year her mother died, Jiang Wei was sixteen. At the funeral, she met her father for the first time and learned that she was born out of wedlock.
She moved to a big city, got a new, expensive hearing aid, and started at a private high school there.
She met Xia Li, and also Xia Li's mother, Cheng An.
Important notes: The older character has no marital relationship; the younger character has a slight disability and is hard of hearing; large age gap.
No spoilers, but readers should be comfortable with a non-happy ending before reading.
Readers with strong preferences for exclusive relationships should proceed with caution.
"I wish I could stay young, and find someone by instinct. Let myself fall for you in a haze, like the rising tide beneath the wind and rain."
Theme: I haven't figured it out yet.