You can definitely be an Alpha surrounded by sluts. You just have to have a high corruption and domination. If you want to share then you need high slut as well. Slut is generally used for the girls attraction to people other than the MC
So far, in order to increase your domination over the waifus, most choices also increases love but most of the corrupting choices, increase slut AND also decrease dominance, so the Slut route is tied to the NTR route at which you have lesser dominance. So you cannot share 'loyal waifus' only grab a piece of 'free roaming' sluts or watch other dudes cuckold your 'loved ones'.
Many choices are forked along the line:
Slut AND Corruption XOR Love AND Dominance; Some are even worse with Corruption AND Slut AND NOT(Dominance) XOR Love AND Dominance AND NOT(Corruption);
So make clear choices which either do ONE of the four attributes or rethink the attribute combination. So far 'Slut' and 'Corruption' are used as an opposite to 'Dominance' and 'Love' too often.
Corrupting someone against their will always leads to / requires dominance. Encourage them to follow their lesser instincts should not lessen their love for you, even if it does corrupt them more. Also slut could be called 'Inhibition' as a broader term to qualify for upholding external / social norms, while 'Corruption' should reflect the willingness to follow personal or primal desires.
The stinging part about NTR is that, the girls that cheat on your MC still love your MC. So making loving sluts and loving corrupted girls should be possible, too.
I will crawl the game some more to find mismatching descriptions, references.
As the game has 'rollback', it is sufficient to show stat increase after the decision. But show it in the dialog-button also works.