"Of course." Severus nodded, glad he'd earned a hug and a smile. He knew he could get away with most things if he played it right. Asking never hurt as long as he covered it with something sweet. A gesture of affection always worked for boys like Sirius. Sentimental.

Putting it on for him, he tied the back firmly and then let go, looking at the necklace with a soft smile - a rare sight from him. "It'll help you heal faster. Not super fast but it will cut the time of minor colds in half and surface damage will go swifter. Less chance of scarring too."