7x9 - My Parents Are Aliens

When Harry cooks Brian and Sophie a romantic meal to help them patch up their differences after an argument, the aliens quickly go to the other extreme and become totally wrapped up in their passion for one another, (much to the children's embarrassment). However, when Josh tries to cool their ardor, Brian becomes convinced that he's trying to steal Sophie's heart. Meanwhile Lucy is up for a prize at school... until Brian and Sophie take it too far.