Worst story. Instead of letting the player get all the bitches, some geeks decide not to and let random losers get to fuck? How dumb can you be exactly
They are contracted to have sex so the succubi can get their energy
Besides, the MC has a potential sex scene with every named female. Most even come back for more or want more, while 2 of them have a potential "happy end" with him.
hell, even his mom (who he doesn't fuck, but she seems like she wouldn't mind) tries to shove her tits in his face daily... The guy has a harem in everything but name only