Al waited until Dad's steps were no longer heard outside the office until releasing a held sigh of something akin to relief.
"I'm so sorry for that," he murmured softly. "Dad's too fond of offering advice."
Skittishly, he approached Severus. "Don't move just yet," he warned, not particularly eager to be touched. He needed something, nonetheless, so he leaned in and rested his forehead against Severus' shoulder.