The moment Bobby said not to be mad at him, Mika's heart sank and her worst thoughts came flooding into her head. She really hoped he wasn't implying that Dean was here but before she could even muster any words to come out of her mouth she saw Dean sheepishly enter the room to get to the kitchen. She looked away and at the floor as he entered the room, all that hurt and betrayal coming back to her . She didn't want to see him right now and now the world (or in her case, Bobby and John) was out be against her. 

She refused to look at either of them as Bobby dealt with Dean in the kitchen, refusing to let him to just grab a coffee and refused to let him leave either. Despite not looking at either of them just to avoid looking at Dean, she she was listening to them talk and she had to admit, she was also curious as to why Dean got dropped off here of all places and not just another grubby motel that John was possibly staying at. Just for once she hoped John would actually be a father to his son and keep him with him. She thought that being at home with her uncle would be her safe haven, but John clearly had other plans. 

She listened as Dean told Bobby this was why he can't be here but Bobby being Bobby corrected him and put him in his place in the best possible way he knew how. Hearing their strange relationship, if it even was that be called as 'object permanance' maed her heart pang more with pain, making her hug the cushion so tightly she would run a risk of bursting the seams. Yet it was the moment he declared neither of them were leaving this house until they had spoken this out that got Mika looking up and at Bobby, the question 'what why!?' written clear on her face. 

She watched Bobby walk into the room, sit in his chair near her and then at Dean still refusing to look at her as he followed on into the room. She didn't know what to say to him, she may have had a thousand and one questions bouncing around her head but she couldn't think of a single one to actually say so she looked back down again remaining silent for what could have been easily twenty minutes before she finally mumbled out something, knowing that if she didn't they'd be silence for much longer. 

"Why you'd walk out and break your promise?" she finally mumbled to Dean.