Severus' smile sharpened. "Excellent!" he hissed. "Glad to hear you're putting Blink to such good effect."
He huffed a chuckle at the ticklish sensation of Al nuzzling at his jaw, and wrinkled his nose at the scent of smoke. "I've learned that you're a grubby sod, who seems to have mistaken me for a scratching post." One of the hands resting at Al's waist snuck down and he gave Al a small swat. "Bath, brat!"
He loosened his embrace and strode into the adjoining room: once this suite's sitting room, now a makeshift lab.
It didn't look anything like a bathroom. Not that that stopped him.
"Accio Size 42 Pewter!"
With a kettledrum clarion, a truly massive cauldron rolled into view from the far corner of the room, settling with a ringing, rolling rattle on the floor. Snape set a hand on the waist-high rim, and a quick Aguamenti and Relashio later, the cauldron had become a decidedly unconventional bathtub.
Severus gave an inviting wave. "Last one in's a Hufflepuff."