Bab 166: Chapter 166 - Attack(Part 3)

I watched in disbelief as her body began to change shape, her skin turning dark, leathery and scaly like a reptile, her legs merging together before narrowing and elongating, as her neck extended as well. 

Her face and head took the shape of a snake's, her hair shrinking into her hair as another snake head appeared at the end of her tail, what had been her legs just a few seconds ago. 

No way...I didn't think there was anyone in the present who possessed a Contract with a Monster. A Contract can only be formed if a Monster consents to it, it's a mutual, two way agreement. Plus the Monster has to have a fairly high level of intelligence for it to work, a level that's usually only found in Demonic Grade Monsters like Izzy.