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When thinking about it.
Stolitz is a cute ship, because they met when they were little kids, and Stolas fell head over heels for Blitz, from day one.
Though, I can see why Blitz is hesitant to fall in love, and or at least show that he romantically likes Stolas.
Blitz lost his Mom, lost Fizzarolli, and lost Fizzarolli.
All of which he blames himself for.
Love doesn't come easy for him. Especially cause he's an Imp, and so he's treated lowly simply because he's an Imp.
Love also doesn't come easy for Stolas. His arranged marriage with Stella shows that. As well as shows that he's desperately trying not to lose his daughter in the process of freeing himself from the abuse he suffered from Stella.
And then, I can see Octavia's view of things. I don't think she hates Blitz, or that Stolas is seeing someone else, while still being married to Stella.
She wants her Dad to be happy, just as much as he wants her to be happy.
She just fears her Dads relationship with Blitz, will cause her to lose him.
And Blitz, probably is reluctant to fully be in an actual relationship with Stolas, cause he probably feels like a fuck toy, as the deal was, they do their kinky shit every month on the full moon, in exchange for the magical grimoire once a month. And in turn, he feels like he's being used, rather than Stolas genially loving him.