It just hit me; Yami, playing with dolls. Specifically, a Yuugi doll, and an Anzu doll. He mushes them together and makes kissy noises.
What I need to figure out is who stumbles upon this scene; Yuugi? Anzu? The both of them? Jounouchi? Kaiba? Mokuba? Mai? Bakura? Otogi? There's so may options, I'm kind of paralyzed, but I really, really want to write this insane little fic. Who ever picks the person to stumble upon the scene first, gets my thanks and a fic.