Cuckee as far as I know.
Gotta ask
CulturedGamer if there is a possibility of a route where YOU are the cucker down the line (maybe one sub-heroine could be an option methinks, but there is no evidence yet that this would happen down the line).
Far as I know the plan for now is for the cucking to have two possible states that you can choose at some point: either hidden cheating with you being (somewhat) oblivious or at least in denial OR you purposefully using the girls getting willingly cucked in exchange for gaining power (the MC has this whole thing about wanting to become someone in the world and he has a lack of power as of yet, so the idea is he can gain that power at the expense of getting cucked regarding the different girls).
I think its an interesting idea, one I havent seen done before either. Also I can see this might be very cool for people who maybe arent interested in one of the girls? Like knowingly use them to gain power while aiming for one specific girl (and then failing for her too but unknowingly). But yea. Gotta ask Mr. DevMan if plans changed or if that is still the general plan.
Atm you are primarily the "cuckee" as you put it.