Twisted Fate by Katherine Isaac

A drunken university social. A permanent magical bond.

Nathaniel St Clare is a witch with a unique and dangerous brand of magic. The classes at Bishop University are the key to understanding the depth of his power, but an unexpected roommate interrupts his plans.
Marcus Reed is a shifter looking for a peaceful life far away from home. However, mastering his nature proves an arduous task.
When an intimate moment has unexpected consequences, the two of them need to decide what it is they want from each other, and hope the magic agrees.