Severus leaned down and kissed Draco again. "If you did not whine and complain I would suspect an impostor," he said with amusement. "And I severely doubt that any of my students have any interest in me." He was still not entirely convinced that anyone other than Draco had had any interest in him, despite what Terry had said. It seemed inconceivable to him.
He let go of Draco reluctantly when he stepped back. "Your son being born for one," he said with a small smile, feeling pleased and strangely touched that Faustus had missed him and suddenly realising that he'd missed Faustus as well. The smile disappeared when Draco said that Narcissa knew. That was not news he liked to hear. He knew it was impossible to keep Faustus' existence and his parentage... or at least one half of his parentage... a secret but that didn't mean he was at all comfortable with Narcissa knowing.
"Inevitable, I suppose," he said grimly. "Though I suspect Bellatrix already knows. At the very least, Rodolphus would know by now."