You're not seeing the vision, folks: This is clearly just setup so Sakura can guilt trip herself next chapter into a tearful confession to Saaya who'll just go "Bruv, of course you're still allowed to have friends when in a relationship."
Yeah, I think this was the intention. Sure, Saaya might not see it as cheating, but Sakura if explained will likely go into that. Also to the ones just ignoring the damn fact one of them just started damn crying asking for a promise to be the "only one" that gets to have this type of fun, yeah it damn feels like cheating even if it isn't. Subtext, people.