I didn't expect that. Oh, it's so heartbreaking. Everything; Narcissa and Lucius, Draco's pain, Harry's pain, Scorpius eventual pain...
I hope everything turns out right; Draco can't reject his son, he can't... his own son. He'll still be perfect (though actually, nobody is perfect, and Draco should stop thinking like that) even if he is scarred.
I don't understand why nobody put wards around the working area...