City of broken Hearts

POST COLS (takes place before the events of COHF)
Warning! BOY x BOY content up ahead from here onwards :)

Everyone knew that Sebastian was his own breed of monster. He had his own category, and he knew it. He just couldn't bare to accept the fact.
What happens when Sebastian comes across a broken Shadowhunter at an abandoned subway?
Alec Lightwood became completely at the mercy of Sebastian Morgenstern. While the Clave is out of blood, Alec is being torn apart, and Sebastian intends to mend him back together- but in his own vision and design.
Will Magnus come for him? Or does he even care?
Day by day, ALec is losing hope and feels his grip on reality slip away. He just hopes his friends get to him before he becomes the slave of the demon child.