During the Phantom Bride event Sebek says that, as students, they should be studying and not eating their time with un-academic pursuits like romance. When Grim points out that Eliza turned him down immediately Sebek insists that it was he who did the shooting down, as “My schedule is already packed with training so I can protect Malleus. There’s no room for romance.”
Beanfest begins with Malleus wondering why Sebek has “prostrated himself on the floor and started sobbing inconsolably”. Sebek insists upon lodging a complaint with the school in response to his being assigned to a different team than Malleus for the event. (Silver: “Please pretend you didn’t hear that, Father. Sebek’s just throwing a tantrum because he didn’t get on Malleus’ team.”)
Sebek explains that, as a first-year student, this was his one and only change to team up with Malleus for Beanfest. Lilia encourages him to enjoy it as “We have precious few chances indeed to turn a blade upon a king in our lifetimes”.
Sebek insists, “I swear on my life that I would never turn a blade upon my lord!”
Sebek is similarly distressed before Vargas Camp, arriving to the mirror chamber after Silver because “he insisted on guarding Malleus up to the last possible second”. Sebek also insists upon escorting Malleus back to Diasomnia when the weather becomes suspicious during the Wish Upon a Star event, leading directly to Malleus missing the Ortho-made meteor shower.
Malleus cryptically responds, “At least you can count on the stars to never betray you…”
In a vignette we see Sebek insisting upon escorting Malleus to his classroom and then reprimand Ace and Grim for running in the hallway. Malleus responds, “Your enthusiasm is touching, Sebek, but isn’t it about time you returned to your own classroom?”
Sebek is shocked by the idea of Malleus emerging from his class to remind him not to be late (“Your consideration knows no bounds!”) but Malleus reveals he was doing nothing of the sort; he is leaving to go to his own class.
This is kind of a confusing exchange on EN because Sebek literally just escorted Malleus to class—so where is he going? The original line shows us that—much like housewarden meetings and school ceremonies—Malleus was not informed that the location of his next class had been changed, so that is why he is leaving his classroom after just being escorted to it. The EN version of the scene seems to vaguely insinuate that Sebek escorted Malleus to the wrong classroom and Malleus simply chose not to correct him, which is also amusing.
Other times Sebek references Malleus is when he tells Cater that Malleus was attempting to assuage Sebek’s own anger during Halloween (before becoming enraged himself) and when he chooses to look for Deuce during Vargas Camp because “I could hardly tell my liege that I abandoned a fellow freshman in his hour of need”. Sebek’s wish during the “Wish Upon a Star” event is “for the whole world to kneel before our king”.
Idia insinuates that Malleus might not be more powerful than a final boss (Sebek declares he is “the most powerful being in the world”) and Sebek is not amused. In Glorious Masquerade we see Sebek become jealous of a goat that Malleus pays attention to.
Later, Malleus chooses to sit next to Grim at a table. Sebek insists on a game of rock-paper-scissors to battle for the seat, and loses. When Rollo expresses interest in sitting next to Malleus, Azul recommends that Grim sit on the prefect’s lap.
Sebek insists someone allow him to sit on their lap, too, so that he may sit at the same table as Malleus. When Azul points out the Sebek is extremely large, Sebek asks Azul to sit on his lap, instead. Azul says no and Malleus sends Sebek away.
Twisted Wonderland Reference Note 