I Won't Give Up On You ~ Teddy Lupin
In this story, Remus Lupin and Nymphadora Tonks had their son, Teddy Lupin, around the same time James and Lily had Harry. And Tonks and Remus are the same age. This way, Teddy goes through his years at Hogwarts with Harry.
Alliette Greengrass, was a Hufflepuff, despite the rest of her family all being Slytherins. Her parents were not to pleased, though grateful it wasn't Gryffindor. Imagine their distress when she falls for one. Teddy Lupin.
Alliette is what you could call, broken. Picked at and pushed around by her sisters (Astoria and Daphne), she gets quite lonely, you'd imagine, being the least favorite daughter.
When Teddy Lupin meets Alliette, all he wants to do is fix her. He won't rest until he does. But, she refuses to talk to anyone. Rejected and neglected by her family, she spends her time taking apart muggle objects, finding out how they work, and putting them back together. She's great at fixing things, but not people. Not herself. That's what Teddy wants to help with.
But how can you fix something you can't hold?