[He cants his head slightly, though a flicker of emotion - frustration and nostalgia - passes through his expression. He knows she's right, but he doesn't know how he knows that.
Lily, he assumes. Lily is a good answer for anything he can't quite recall.]
I suppose not.
[A beat.]
Perhaps you ought to call me 'Severus' instead of 'Mr. Snape'.
Private
Lily, he assumes. Lily is a good answer for anything he can't quite recall.]
I suppose not.
[A beat.]
Perhaps you ought to call me 'Severus' instead of 'Mr. Snape'.