Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-4815136-20130801004021/@comment-4802762-20130801195048

It started off as gratitude. But I think with everything that happened afterward, it evolved into genuine feelings. I mean, it's not like they showed us every second and every detail of what happened while she was caring for him. Derek didn't kiss Erica back because he didn't feel anything for her. He slept with Jennifer partially in the heat of the moment and partially because he cares for her. There's no denying there's a connection but, in supernatural shows, that's very common and there are a number of explanations why. Hell, in the REAL world, connections like that form quickly over time.

In regards to your last question: Haley Webb said during Teen Wolf: Revelations that Jennifer was freaked out at first but then she witnessed Derek fighting for his life against Kali and her love and protectiveness towards him overshadowed her fear.