Yami felt himself relax after Serena answered intensely which he would match now that he was not worried anymore but happy. Then hand that help her chin before slid to the back of her head and in her hair. 

Seto was coming back into the main room and at the door when he stopped in his tracks seeing Yami and Serena for what looked to be kissing. He walks over as he closes the door to given them privacy and gently. "It's time call it a night before something else happens." Marik, call them back from back from the kitchen and get some sleep. Set, stay or go, I am going to bed." As he rubbed his temples in frustration and for how tired he was.