Seeing Bobby roll his eyes told her he only believed half of what she told him which wasn't entirely surprising to her. She glanced toward Dean when Bobby asked where his clothes was, curious to what his excuse would be that wasn't 'I screwed your niece'. His excuse of vamp blood seemed rather reasonable to her, but looking back at Bobby it was clear he was having none of it. 

Having Bobby lecture them in his 'i'm not angry, just disappointed' tone made Mika not sure if she wanted to laugh or feel bad about her activities with Dean, especially when Bobby said about not even thinking of coming back inside until the morning and to do so fully dressed. Dean's attempt at a defence comment made Mika raise an eyebrow at him as if to say 'really?' as she was hoping he would have just kept his mouth shut and not try to tell Bobby where they had their incredibly amazing romp. 

She flinched when Bobby yelled at them to just get upstairs and shook her head at Dean as he gave her the look of 'oh shit..it just came out'. She then looked at Bobby as it was clear he wanted to say something, expecting another separate lecture for her, she found herself pleasantly surprised that he didn't lecture her, and instead said something rather nice. 

"I did, thanks Uncle. Get some sleep yourself okay?" She said back to him softly, always worrying about his health, even when she was slightly still drunk. With the words said and exchanged she headed upstairs, gently pushing Dean up them in front of her. 

"Come on Dean, the bath and bed are calling us" she whispered in his ear with a smile on her lips.