Actually, on second thought, Lily was probably a bit too tired to be taking any dares right now, so they might be able to restrict the game to truth. But it was still a silly notion, regardless. So again, instead of answering straightaway, Severus plucked one of the apples out of the basket and took a bite of that.
And then he thought, what the hell?
They'd always enjoyed that game when they were younger, and he had no reason to think Lily wouldn't enjoy it now, as well. Or, if she thought she was a bit too old, she might at least enjoy reminiscing. "How about a game of truth or dare?" he asked with a slight shrug. "Provided the dares aren't exceptionally taxing, I mean."
She'd probably laugh at him for that, and likely not in a good way, but it wasn't as if anybody else would be hearing or seeing them any time soon.