Lin, because she'd dated him for so long, knew just how red Tenzin's face could get. She knew just how angry he really could become. He'd gotten that from his mother, who he really did not appreciate anyone bringing into the conversation. It was a sore point. So she knew his temper well. But even she was surprised by how red he got when he caught her and Korra fucking in the Council Chambers. And she knew that once Korra overcame her mortification, the girl would find it just as funny as Lin did