You were possessed by some love Demon. The Demon can make people fall madly in love with them. Dean figured you were possessed. So he thinks of a plan and goes to go through of it. He is unaware the control you have with this possessed demon. Whenever you touch someone's head you can make them think whatever as long as it involves love or control. So Dean being Dean he bust into the motel ready to fighting but before he can he was pinned and He saw that pink from your hand. Then his mind went blank like he wasn't in control

"Ngh..." Dean's eyes dilated looking into your pink hued eyes unsure but he starts to feel different when you speak*