>Aika wants to continue watching Kanade and Fuyuhiko from afar
>Tasuku is giving her the perfect connection even if she and Fuyuhiko make up (by making her Kanade's sister-in-law)
I think Tasuku knows the gameplan, and this can probably kick off a separate storyline if the author felt like it (as in a sequel storyline, let Kanade and Fuyuhiko finish theirs first, damn).
Also, sadistic self-loathing love rival x romcom-educated ace wingman is such a weird side ship.