My mistake. How could I ever have thought otherwise.

Even if the tune Sans had started now wasn't a true song like earlier, there's something relaxing about just listening. A twitch of his fingers summons a pair of hand constructs to settle down at the piano in attempt to softly play along. Not quite harmonizing, just weaving another melody in.

With his own hands: Of course it was bad. It was awful. But spend enough time around someone, and apparently their sense of humour rubs off.

His expression is long-suffering but fond.