Severus was scowling as he headed down the stairs with Faustus at his side. He wasn't scowling because of the new robes Draco had insisted on buying for he and Faustus. In truth that had just saved him from having to waste his valuable time on that task. Nor was he scowling at being forced to spend the time stripping the potion residue from his hair in the shower and the subsequent need to tie it back once it had dried. He probably would have done that anyway. He didn't like playing in pureblood society but he could do it when necessary.
No, he was scowling because after he emerged from the shower, dried himself and his hair, dressed, tied his hair back and deemed himself ready, he'd headed down to his workroom. Only to find that everything in it was gone, including the potions he was working on. When he'd questioned a house elf, he'd discovered it had been done on Draco's orders. He wasn't sure if he was irritated at the house elf's simpering, having his plans stymied or the fact that Draco knew him far too well. He was, however, sure that if any of his ingredients or potions were damaged, harmed, destroyed or rendered useless in some way, someone was going to pay.
They got to the bottom of the stairs and he stopped, placing a hand on Faustus' shoulder and waiting until his son looked up at him.
"Do not get into trouble. Do not cause trouble," he said dryly. "You know who you should avoid but if you find yourself in a situation you don't like or are uncomfortable with, find me, Draco or Tracey. If you cannot find any of us, look for Adrian Pucey or Stephen Cornfoot and any of his family. Do not even think about trying to get your hands on any alcohol. The house elves have their orders."
He looked his son up and down. Draco had done well with the robes he'd chosen and Faustus looked every inch the young pureblood, which in truth he almost was. He was also very clearly trying not to roll his eyes, which was moderately amusing and quite likely something he'd picked up from Draco.
He sighed and placed his free hand on Faustus' other shoulder. "Ignore any derogatory comments that may be made about me. They are irrelevant and you do no credit to yourself or to me by reacting to them." he gave his son's shoulder a gentle squeeze. "You are my son and I am proud of you. Nothing else matters."