When you're a 9-year-old girl who wants to look like Rapunzel, cutting off your long, blond hair is basically unthinkable.
Not for Libby Tucker-Spiers of Milton Keynes, England, however.
The little girl decided to do just that after seeing her 7-year-old friend Aiden Selleck at the hospital, shortly after he had undergone a round of chemotherapy. Aiden was diagnosed with kidney cancer in April and had recently begun the first of 30 rounds of chemo.
"Aiden was in bed because he had a temperature. [Libby] saw him on the bed, and he was pale—white as a ghost," Libby's mother Charlie Spiers tells ABC News. "I think it shocked her because he didn't have any hair. The last time she saw him he had curly, blond hair."
That's when Libby told her mother that she wanted to donate her hair to Aiden.
"She said, 'I want to give Aiden my hair,'" Spiers told the news site. "I said, 'You can't,' and she said, 'But I want to—I miss his lovely hair.'"
Libby was insistent, especially because she and Aiden have known each other for most of their lives, even calling each other "boyfriend and girlfriend," Spiers says.
While Aiden preferred not to wear a wig, Libby still wanted to help out in some way, even if that meant sharing her hair with someone she perhaps didn't know.
That's when Spiers talked to Libby about an organization called "Little Princess Trust," which makes wigs for boys and girls for about $540 and a hair donation.
With Libby on board, her mother—along with Aiden and his mother, Clare Selleck—visited a salon and had 11 inches taken off Libby's hair.
"[Aiden] just kept looking at her, saying, 'Oh, Libby, are you OK? It's going to be short!" Selleck tells ABC News. "She obviously didn't have to do that, and it's lovely that she wanted to."
Now Libby is fundraising for the wig and an "End of Chemo" party for Aiden. She has approached local businesses and launched a crowdfunding page, Libby's Locks for Aiden.
His 30 rounds of chemo will end on December 30, according to Selleck, and he hopes to have a party at a local soccer stadium after his last treatment.
And Spiers is proud of both Aiden and Libby, who also has global developmental delays.
"I'm so proud of [Libby]," Spiers tells ABC News. "She's got so much going on herself with her own learning difficulties. She's just selfless. She's an amazing little girl, but Aiden is just as amazing. He's so brave."