Seb was so, so excited to hang out with his friends in a muggle setting. It would've been adorable, but it was more weird and nerdy because he played (and won a few) games of MarioKart. He loves the Wii.
As his family does not grow or make anything, he took his dad's hard-earned money and tried to buy cookies. His mother was appalled at the idea of him bringing something store-bought to a party like this, so she made him take zopf and carac - the carac came from a swanky bakery, because Maman has her limits.
He was a little more relaxed and goofy than usual; he was very smiley and bubbly. He loved being able to socialize without the weight of school hanging over his head. He joked around with Dani's family and with his friends, having fun and promptly falling asleep as soon as his head hit the pillow that night.