Woha woha woha, dude! No real plot? The plot is the entire reason our little Spy family exists in the very first place! Only because Twilight has to get close to a paranoid hermit-like politician he got a little girl to act as daughter and only because she is at risk of being suspicious Yor got married to Twilight to avoid getting arrested/Twilight married Yor because he needed a mother for the interview, said interview which is for the school which is for the sake of the mission of getting closer to the target. Compared to Yozakura, SxF had like 14 out of 18 plot-related chapters - ground-work for the mission, get a kid, get a wife, get into school, have a plan a and b, watch both plan a and b fail and try to come up with plan c, gather Stellars, get closer as a family (all for the sake of the cover ofc :P). get a dog as reward which will boost Anya's Espers powers making her more powerful to do what might need to be done to help Papa with his mission. Like SxF story telling makes sense, it has a red string, it rises the stakes slowly but surely, it increases the cast chapter by chapter without leaving the new characters that matter as one-panel-off-charas and it always, ALWAYS, keeps its eyes on the big picture which is Twilight's mission: Get to Donavough or whatever his name is as quickly as possible or the cold war might turn hot really fast~
Yozakura on the other hand like you showed on the page, started with quite some serious baggage but said trauma was discarded like ch.2 and never mattered after that anymore. And while they are supposed to "be a married couple",they feel less like lovers like Juliet and Romeo did after their first two chapters in
Kushuku Gakkou no Alice. The whole time some psycho is after Mutsumi, Taiyou saves her and that's it. That's not romance, that's just damsel in distress with extra action.