it was cold in December and it was freezing cold even inside the Bunker.

you were trying to stay warm with sweatshirts and blankets even hot chocolate.

while you were on the couch watching TV, Dean was fixing his beloved impala in the garage, you were bored so you decided to go to Dean as soon as you enter you notice that he is half-sleeved and wearing his usual jeans, maybe it makes him feel hot because he was constantly moving.

Dean comes out from under the car and looks at you.

Dean:"hey honey, why here? Did you miss me that much?" smirks and looks at you, how could he not be cold?