Heroines, Villainesses, and the Hero's Yandere Harem? I want them all!

Iwasbetrayedinmyfirstlife.Acripple,brokenanddiscarded—IdiedaftercatchingtheoneIlovedinbedwiththeonlypersonIevercalledafriend.Thatwasthestartofrealtorment.WhenIwokeup,itwasinanotherworld.Agoddessstoodbeforeme.ShetoldmeIcouldgoback.Backtomyworld.BacktoeverythingIlost.AllIhadtodo…wasplaymypart.Thesidecharacter.AndIdid.Ifollowedthescript.Playedmyroletoperfection.Theyhatedme.Mockedme.Usedme.Againandagain.ButIkeptgoing.BecauseIbelievedher.BecauseIwantedtogohome.Thenoneday,Ifoundout.Thehardway.Itwasallalie.Therewasnogoingback.Thereneverwas.Sheusedme.Again.Justlikeeveryoneelse.ThrownawayliketrashonceIoutlivedmyusefulness.Thatwasthedaysomethinginsidemesnapped.Andso,Imadeavow.Iwouldtakeeverythingfromher.Iwouldenslaveeverysingleheroineshechose.AndIwouldkilltheherosheplacedallherhopeson.Ifshewantedtoprotectthisworld…ThenIwouldburnitdown.ButthemoreItried,themorethingsstartedtochange.Andthenoneday—Ifoundoneoftheheroines.Oneofthehero'syanderesIhadenslaved.Shestoodthere,trembling,aknifeinherhand.“You’renotgoinganywhere,”shewhispered,eyeswild.“Iwon’tletthemhaveyou.Youbelongtome.”...What.The.Fuck.Is.Happening?!