Flat White Flex: A Nerd-Gets-Jacked M/M Romance Fueled by Coffee and Kink

by Knox Ryder

Shy barista Simon has a crush problem—and the solution isn't extra foam. To get the attention of gym god Cole, Simon uses his chemistry background to brew up some muscle and soon he’s bulking faster than his apron strings can stretch.

But bigger muscles mean bigger stakes. As Simon transforms, so does the heat between him and Cole—and soon the café isn’t the only place steaming.

Flat White Flex is a gay muscle growth romance with a nerdy barista, chemically-enhanced coffee, and plenty of steamy worship.

122 pages, Kindle Edition

Published September 14, 2025

About the author

Knox Ryder is a Manhattan-based writer known for his muscle growth fantasies. When he's not crafting tales of transformation, Knox is often discreetly enjoying the view of broad-shouldered men on the L train, his mind already spinning new narratives of power and desire.