Baby
Lily hated being treated as the baby of the family. Victoire never spoke to her; Rose acted as though she knew more; and Dominique just blew smoke right into her face. At the age of 16, at a party she had only been invited to because she was James' sister, she drank a shot of firewhiskey and snogged Molly's boyfriend, Tommy Boot, senseless.
After that, there was no turning back.
Instead of soft, auburn curls, she cut blunt bangs. Gone was the pale lipgloss; you knew who her latest victim was based on the red lipstick she left behind. No more studying and stressing over every little detail.
Victoire began to spill all her secrets. Rose invited her everywhere she went. Dominique offered her fags, and they smoked together on the roof of Hogwarts.
At age 17, she began seeing Lysander Scamander. He was perfect and wild, and they snuck out late at night and made love in the Shrieking Shack. He cheated on her with Roxanne exactly two days later, and she hexed him until he was begging for mercy.
She dropped out of school, and headed West, for America.
Albus tried to lure her back, and James got her as far as accepting a plane ticket. (She thought better of it, and promptly ripped it into shreds.) Her mother Owled every day.
And of course, when Lysander showed up at her workplace, she died laughing. What in the bloody Hell were they thinking, sending that boy here?
But she still loved him with every ounce of her body, you see, and she did indeed come back with him. They started over, and she lived with him in his new flat, and they stayed up late and drank tea in the mornings and reminisced on their innocent days.
She let her bangs grow out, and she started to curl her hair. She found some pale lipgloss in a drugstore; she purchased it just for kicks. She enrolled back into Hogwarts, only after begging McGonagall to take her.
No one treated Lily as a baby anymore.