Passionate and forceful? Well hey alright, except for very not!
Dean's conscience and his little head were at war right then. But it was a wholly unfair battle with those little sounds Max was making, and he put an arm around her, continuing the kiss, pressing it deeper.
All the while, that battle was waging, and finally lust won. He'd go to hell for it eventually, but he was fairly certain in the long run that it would be worth it.