The thought of him developing into a younger version of Draco terrified her. Draco's influence was strong, and it was clear Lucio loved his father very much, as he didn't know the extent of the rot that lay beneath that polished exterior. Draco at least played along when Lucio was present, for which she was thankful. He would not hurt her or show his sadistic tendencies when their son was close by, and saved it for when they were alone. With Pansy's help, they were able to keep the illusion of a happy, loving couple, although sometimes Draco's intensity did bleed through, as it had earlier that day.