Misa continues staring at them, equally like a deer caught in the headlights despite her being the one that caught them in a compromised position. Her eyes stray downward and then up again, taking in details she doesn't want to notice but can't really help seeing. Every fiber of her being is screaming at her to turn and run or at least look away, but it's like time has stopped in the room and they are all trapped in this uncomfortable moment for eternity.

Lazarus saying terribly awkward things is at least a return to normality, despite the situation at hand. Misa has a precedent for reacting to him saying the worst things, and she clings to that familiarity in the face of so much that is unfamiliar. Such as presumed straight virgin Lazarus very obviously about to have sex with a man in her living room. She has no idea if the offer to join means this isn't anything serious, or if he is just rattling off every terrible thought that goes through his head at once. She also has no idea which option is preferable. But judging by Cesar's expression, the offer was not mutually agreed upon.

Misa opens her mouth to say something... then closes it. Her face cycles through several different expressions: incredulous, embarrassed, looking like she is about to cry. She abruptly turns on her heel and flees back into her bedroom, slamming the door behind her.