Mika could totally understand why Dean would be incredibly pissed off at his dad, if the roles were reversed she most certainly would be in a sour mood over it as well. He had every right to annoyed at his father for coming up with this plan behind his back, especially knowing how he enjoyed a hunt and didn't like his dad doing the big ones on his own. Yet she could also see why John wouldn't want Dean putting himself in a life or death situation to that extent at the same time, which surprised her she could even think such a thing. 

Hearing and seeing Dean say he would be right in made her satisfied that he heard her, she watched as he continued doing what he needed to, so not to leave the pinto car in a precarious situation. She waited for him to just make sure that he would be okay and not do something stupid, but that wasn't long lasting as he hurt his hand and threw the wrench across the garage and jamming into the wall, making her flinch ever so slightly. 

It was then she could truly tell just how touchy and up and down his mood was and for the time being they would all need to step carefully around him until he could let go of his stress and relax again. When he glanced at her and apologised, she smiled and shook her head, "Don't be, it's okay. If anyone can understand your feelings right now it's me. So no need to apologise" she told him, tenderly putting a hand on his back and rubbing her thumb up and down his shoulder blade. 

"Come on, before the food gets cold or Bobby eats it all as payback for our shenanigans" she smirked at him, going to give him a kiss but remembered he had grease on his face and stopped herself. She patted his back and lead the way back into the kitchen, where she grabbed a plate from where Bobby always kept them and sat down at the kitchen table, rummaging down into the bag and grabbing the food in question.