Oh, that was charming and quite lovely. I liked the balance here -
It changed him slowly, for skin hardened from long years of exposure takes its time in softening. and He scoffed when Harry insisted on giving his second child Severus’ name, but when Harry left his office, he looked at the photograph in his hand and hoped the feeling in his chest, as if his heart was slightly too big for its confines, was not an impending coronary. -
It's sweet without being cloying. Gentle without being overly-soft. Very nice.