Anon falls in love - sh.itjust.works

Hears her Mom for the first time... which means she's never heard words before... how the fuck does she know what "I love you, please marry me" is supposed to mean? It's just a jumble of new, incomprehensible sounds...

Being able to read and write doesn't mean you can understand spoken language, or speak.

Deaf people know how to read lips to understand people who donโ€™t know sign language. Also โ€œhears for the first timeโ€ might be an embelishment in the story - lots of people are partially deaf and can hear something, just not enough to understand the words and they revert to lip reading.
Deaf people arenโ€™t necessarily mute, and can often โ€œhearโ€ their own voice.
My aunt is deaf and can read lips really well.