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Mikayla Lewis, 18, was skeptical when her 14-year-old sister, Courtney Lewis, asked to make her prom dress.

Courtney studies technical design and production at Duke Ellington School of the Arts in Washington, D.C. With her big sister’s prom coming up, the teen wanted to put her skills to the test and create a custom gown for Mikayla ahead of the big event at the Academy of Health Sciences in Largo, Maryland.

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Mikayla also helped choose the fabric, thefamily toldGood Morning America.

“I coached and guided her through the design and construction process from consultation all the way to completion,” Herbert toldGMA. “Everyone was in love with it. I think it really captured Mikayla.”

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“I saw her in the dress and, honestly, I thought that I was going to cry a little bit,” Courtney told the station. “Because I was like, ‘This is what I made.’ ”

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The sisters never expected their story to go viral, and Crystal tells PEOPLE she’s just happy to see her daughters working together.

“When Courtney offered to make the dress, and Mikayla said yes, I couldn’t have been more proud,” Crystal says. “It was truly a testament of the bond the girls had formed over the years. I felt relieved that I knew how much they meant to each other. It gives them a story to tell for years to come.”

source: people.com