Severus/Narcissa/Lucius
Grey eyes swept over the scene with a touch of amusement, the cup of tea just touching his lips as he observed Narcissa's friendly behaviour toward his friend. He refrained from raising his eyebrows, instead sipping the cooling tea and continuing to watch intently. It wasn't that Lucius was stalking per se, more like observing the two to discover what they were hiding. He could tell from his conversation with Narcissa that something was up, and he'd be damned if he wouldn't find out about it. The little café across the street from Potage's Cauldron Shop ended up being the perfect location. Somehow, he just knew that Severus would end up going into the shop, accurately judging his friend's penchant for Potions.
When Narcissa leaned up to kiss Severus, the fair brows did lift and he set his teacup down, unconsciously leaning forward at the surprising scene. A few seconds later, steely eyes narrowed, and he was sitting up, ignoring the server approaching to ask him about his tea. He slammed a handful of galleons down, drastically overpaying, before collecting himself and standing up a little taller as he left the café. A smooth expression replaced the heated surprise, his gait slowing when he approached the two, instead turning into a self-assured saunter.
Lucius was pleased with the little look of worry on Severus's face as he approached, tucking his hands into his robe pockets in a casual display. "Well, fancy meeting the both of you here. Have you had a productive outing?" It was aimed at Narcissa, but he saw the panic rising in his friend as Severus took a step back and averted his gaze, suddenly finding something quite interesting about his new purchase.