Currently written as
Which is really vague and tbh could be interpreted in a few too many ways. The way it's written it almost sounds like it needs to be group sex so I'll dismiss that interpretation right out the door. Aunt and Sophia at the same time, plus cousin and Chloe at the same time could be argued as 4 people simultaneously(?) engaging in consensual sex, but each pairing only knows about 1 other girl and not the other women or the other pair.
It's kinda borderline and could be argued either way imo but what confuses me is how plenty of games have the harem tag when the harem content is only so far developed as the MC essentially cheating on all his other LIs. Following the standard of how the tag's normally used but not written it's a harem game, as the tag definition is written it's borderline, and as for what the dev actually has planned who tf knows, but I doubt it won't be a harem.