Canon implications of Lil Cal [Caliborn] sexually grooming the beta Strider household
Despite alpha Dirk having a relatively grammatically correct typing quirk, both Bro and Dave maintain all-lowercase typing quirks akin to predom Calliope; coding both Striders as [Caliborn's] sexual mate.
Everyone knows that Bro raised Dave with strifes in the way he had to "prepare" Dave for SBurb; this culminates in both Striders strifing with Caliborn through his possession of Jack Noir, which we know is coded as erotic to cherubs. "Bro's" decision to prepare Dave for SBurb in the manner that he did cannot be separated from his relationship to Lil Cal.
It should also be noted that Caliborn is in "mating" form every time he strifes after his own strife with Yaldabaoth, as the unconditional immortality he is granted by destroying his judgement clock is the same kind of immortality cherubim are granted when performing their ritual mating duel (including the seizure-inducing flickering eyes and flames).
The sword Dave must use to kill the immortal Caliborn is also associated with cherubic sexuality — the name Caledfwlch is alternate of Caliborn's own name, and while this may at first cause you to associate it with Caliborn, it is actually associated with Calliope. An artefact with a warped name/identity to Caliborn's being able to defeat him is the same function as the power of Calliope and Caliborn's names upon each other (supposedly being able to put them to sleep if you speak their alternate's name), as well as a mating cherub being the only who is able to harm another mating cherub; this further associates the red-lettered, all-lowercase Dave as being Calliope's successor and sexual mate to Caliborn.
Although the puppet snuff involving Dave is broadly known as sexually exploitative regardless, at this point in the story Caliborn a. heavily associates himself with puppets through Lil Cal and The Felt, and b. is known to have an interest in "kid snuff". While Dave is not getting snuffed, the puppet snuff films Dave is forced to partake in can very easily be read as Caliborn creating autosnuff films (immediately related to his grooming of Dave to become his ultimate and deadly adversary in [s] Collide.)
(You notice that the grooming of the beta Strider family is most centric around Dave; I don't think Caliborn has an incredible amount of cherubic sexual interest in Dirk/Bro, despite Bro being coded as a similar kind of Wife to LE as Handmaid&HIC. Dirk&Bro are comfortable and calm with Caliborn's sexual interests which makes him a good candidate for grooming and direct satisfaction, but Caliborn wants to see someone squirm. Bro is groomed to be loving, placating, and submissive to Lil Cal as both Bro's father-figure and husband (a la the Goddess of Manga). Dave, while he attempts to be as stoic and unphased as Dirk/Bro, frequently fails at maintaining a calm and unbothered appearance (often while he thinks nobody is watching, but we know that Lil Cal is Always watching). Dave's natural inclination towards red and lowercase text, discomfort surrounding the things Caliborn enjoys, as well as shared time aspect make Dave a much better candidate to become a warped image of Caliborn/Calliope than Dirk. Dirk seemingly likes Caliborn, even wants him within Lil Cal. Caliborn doesn't want somebody who likes or legitimately wants him, at least not for the purposes of effectively replacing Calliope as a true adversary.)
This is a looser argument with a lot less support IMO than any of the above, but you could certainly argue that the enforced stoicism in the Strider household is a recreation of Calliope & Caliborn's pranksters gambit seemingly being primarily centric around getting the other to break from calm superiority into overwhelmed, exploding emotion. Although Caliborn's love for "games" isn't sexual, he very obviously uses the beta Strider family to fulfill his desire for them.
All the things off the top of my head... If you can think of anything else, please add
[honourable mention: DaveKat, which while you can argue how implied the ship is or isn't when Dave comes out as bisexual, is canonically shipped by Caliborn. Karkat is widely known to have narrative and symbolic associations to both Caliborn AND Calliope, and Caliborn shipping DaveKat can be read as a form of self-shipping by Caliborn(; possibly BOTH self-shipping of himself and Dave, and self-shipping of himself and Calliope? Depending how much you can imagine that Caliborn would project himself onto Dave and Calliope onto Karkat).]
