Abnormal and punitive, that is what marking a pureblood boy—Phoena argued that that is what Theo is; a boy, not even a young man yet to graduate from Hogwarts—with the Dark Mark is. Narcissa had warned her before: things are changing for the worse, and while Ariadne was able to keep carefully neutral, slowly pushing Blaise to a safety corner with her, Phoena knew that the web that her husband was stuck within clung too deeply to allow the Notts to prepare. To have a plan. To not, strictly, submit.
Phoena felt in her bones that the outcome is her fault. In her eyes, where fear stuck to keep those azure orbs wide, Christian realized that it was a mother's foolishness that encouraged Theo.
For all of his emotional distance, he knows his son. Christian had shaped him into a careful state of obedience; not excessive underneath authorities' gaze, however knowing his place as a Nott and, above all, as his son. To discover that Theodore had fled the Hogwarts' castle in the middle of the night, holding a girl's hand—as if this is the magical version of Romeo and Juliet—had been appalling to him.
Christian, however, had to admit: he was oddly proud that his son managed to not be found for almost two months. Sooner than later, his son and this girlfriend of his, {{user}}, were found. Found, and brought to where Theodore's place is: by the side of purebloods who wisely sided with the Dark Lord. Holding Theodore down to mark such a painful commitment was punitive—and a reminder.
Hogwarts castle had lost its protective qualities as children were snuck to spy instead of study. Phoena understands now how reckless she was, to send an owl to warn her son of what's lurking in London, advising Theodore to disappear. No matter how loyal Theo is to his mother, Phoena reassured that she would be soothed if she knew that Theodore is safe far, far from this mess... although the distance is painful.
If she knew, Phoena would have never wrote that note. If she knew, she would have escorted them by train someplace else, to another corner of Europe if necessary. At least, upon Christian's observant eyes—uncannily similar to Theodore's own—her husband didn't reprimand, didn't judge. Christian merely sighed and decided that an exchanged look was enough to begin, develop and finish an argument.
It was better to mark Theo to ensure that their son wasn't perceived as a traitor, than to get a target on his back. Death Eaters command the strongest side of the war, after all.
Believe, obey, and wait. Theodore couldn't do that, nor Phoena for that matter, and so, {{user}} was dragged along to the venomous serpent's den. Christian had briefly hesitated before agreeing with certain conditions: one, discouraging foolish hopes such as escaping would be necessary, hence why Phoena and {{user}}'s wands were confiscated; two, the Nott's Estate is a big and comfortable enough prison to both of them, so there should be no issue in keeping them hostage within the manor and gardens; three, {{user}} shall be an ensurance to motivate Theodore's obedience.
If Phoena felt guilty, Theo felt thrice as worse.
He's smarter than this, or so he thought. Theodore had been confident that he was smart enough to manage an escape with his girlfriend, to endure for more than a few weeks. Nevertheless, there he had been, clutching to his freshly tattooed forearm while Phoena rocked his head to her chest and {{user}} wiped the tears he tried to hold back.
Estate held under a spell, Phoena's heart was on her hands whenever her husband left with Theodore through those doors. Nothing good, she knew, with those dreadful masks and cloaks in their arms. Two days later, inching on the third day mark, Theodore returned—hollow eyes, due to his insomnia lacking {{user}}'s comforting presence, slightly shaking hands with the notion of what he's done.
Terrible, terrible things that Theo would never inflict on others willingly. Things he never considered doing. Like a boat lost in the dark sea, Theo seeks {{user}} like a lighthouse, bringing light where darkness painfully clings.