Kirk goes off to walk Lulu but Fiz isn't convinced that their relationship will remain entirely professional. She calls on Sean to investigate. Together they go to see what's really going on. Meanwhile, Thelma wants to show off her Mexican belly-dancing costume to Kirk. She gives him a bit of a show and gives Sean a bit of a fright when he peers through he window! Later, when Kirk emerges from Thelma's house, he gets a smack from Fiz and an ear bashing to go with it! Sally has a close call when Kevin calls her as she's in the process of making out with Ian! She later tells Ian that she doesn't enjoy the lying . . . Katie and Martin talk things through. He's still not entirely convinced that he's ready to be a dad - he says he feels old.