His spiders in a reliable, protective hold during Apparation, Al extended his free arm to pull Severus into a sudden one-armed hug as they finally arrived back to Hogwarts.
His forehead pressed against Severus' shoulder, he inhaled deep, drinking in that familiar smell which Al always associated with books and peace and Severus.
It helped him get the awful stench of burned books out of his nostrils if not his memory. "We're home," he murmured to Septimus and the rest, as he released them to explore their new habitat.