Oh my sweet summer child Nonnie~ I believe this list would be of interest to you ;D
Blanket tag for High School AU, Underage and Cherik. I always and will highly recommend:
A deeper season by etirabys [NC17, Cherik, Romance, Angst, H/C, Student!Charles, Teacher!Erik]
Charles Xavier- rich, introverted, and academic- begins his senior year of high school in 1962. Erik Lehnsherr, despite his own efforts, is the first person to properly reach out to him. Both are astonished to find a human being on the other side.
you follow and i’ll lead by pearl_o, pocky_slash [NC17, Cherik, Firsts, Powered]
When Charles discovers how frustrated and self-conscious his best friend Erik is about his ignorance about sex, he’s eager to volunteer to help teach him and practice. Charles might not have any more direct experience than Erik, but he does have a telepath’s mind full of accidentally picked-up fantasies and memories, as well as knowledge of a few dirty books - and more importantly, he’s been madly in love with Erik for years. This seems like a brilliant, once-in-a-lifetime opportunity that he can’t pass up.
Now he just needs to manage to keep his feelings in check, and not ruin their friendship forever.
The Bridgetown High Advanced Mathematics Society by Quietbang [Unrrated, Cherik, Modern, Angst, Humour]
The one where Charles and Erik meet in math club.
Are You Calm, Settle Down by Cesare [G, Cherik, Pre-Slash]
This isn’t going the way he pictured it at all. He thought Charles would try to grab the book and maybe they’d wrestle a little, and then Erik would return it and muss up Charles’s hair and get to see him blush.
There’s a blush on Charles’s face, but there’s also a set, mulish expression taking hold. It’s not how Erik wanted Charles to look at him. He’s not sure what he wanted, but it wasn’t this.
Home Together by kageillusionz [G, Cherik, Blind!Charles, Fluff, Firsts]
Charles was born blind, but that does not stop him from falling in love with the new boy in his class. Based off the Brazilian film: ‘Eu Não Quero Voltar Sozinho’ or ‘I Don’t Want to Go Back Alone’.