When he mentioned the cost Lily looked away from him and down towards the floor, her thoughts lingering on Severus for a moment, and the cost she didn't want to imagine him having paid as Regulus did, and probably had for a while. "Rest up while you can, word's coming about where we're meant to go next soon."

Venturing another glance at Regulus, she nodded. "Thank you." Lily paused for a moment, looking thoughtful, before she ventured the smallest smile imaginable, seeking to break the tension as well.

"You were brilliant, by the way." It had been completely terrifying, but he had succeeded in what he meant to do and helped them all.