Strange mark on his back

(Isla)

"A promise?"I muttered the question and ran my fingers in his mark. The more I touched it the more it glowed so much that his entire back was beginning to form what looked like spirals. The scenery was a scary and mesmerizing one that I gasped and moved back but still kept my hand in contact with him

"W... what's happening…"I muttered in disbelief seeing the transformation before me. It was strange that I kept my eyes glued to his back. He wasn't saying anything but what formed on his back looked like some sort of a wolf's head and the half-crescent moon with a star seemed to be on top of the head of the wolf's head extending down to his waist where his jeans started. The outline of the eyes, the mouth with sharp canines had me frightened