His smile faded a bit. Yes, his grandmother was always the one musing over him, her or his father but never his mother. No, he felt a bit hollow because of that but he always cover it up with indifference.
"Better with company, yeah?" He nudge her playfully.
Emma reminds him very much of himself when he was inhis early years in Hogwarts. He was an expert builing up walls but they eventually cracked and imploded so he need not bother pushing himself away from others. If he wanted to laugh he would - rather loudly, if he wanted to be rude he would if he wanted to fight he'll take anyone up. It was much better than bottling his own feelings, but then everyone is different, Emma was much better at hiding things than he will ever be.