The Iron Muse's Cage (Fortress series)

"Sleep, my Little Muse. I will still be here when you wake up."
Sophie is a creator trapped in a world of absolute chaos, her only escape spilling her soul onto canvases and hidden murals. She lives her life by a strict set of rules, hyper-focused, hyper-vigilant, and fiercely protective of her boundaries. But when the outside world threatens her sanctuary, she is thrust straight into the path of Axel-the ruthless, broad-shouldered alpha enforcer of the Iron MC.
Axel is a machine built for war, steel-willed and covered in ink. He doesn't do tenderness, and he certainly doesn't do restraint. But the moment the quiet, artistic girl with the raw gaze crashes into his perimeter, his programming shatters. He becomes her permanent human shield, tracking her every movement and holding her tight against his chest whenever the trauma baseline gets too loud.
As boundaries blur in the dark corners of her father's house, a dangerous family confrontation looms. With the clock ticking down to exactly three weeks before Sophie turns seventeen, Axel must hold an ironclad line against the club's enemies. He's determined to prove to his Little Muse that inside his brutal cage, she is finally safe to create-and even safer to love.