Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-86.143.249.105-20130822214136/@comment-130.126.73.33-20130823064135

I think both. Derek was suspectable to fall for her because he felt lonely and stressed. A relationship was his way to de-stress a bit, focus on something besides just the alpha pack and the death of his pack members. At the same time, Jennifer sacrificed the virgins before she started a physical relationship with him. The sacrifice might have given her the power to look more innocent, sweet, and endearing thus allowing her to seduce Derek.