User blog comment:B214/Volume 23 discussion blog/@comment-201.19.100.21-20170409030136/@comment-3965848-20170409193500

@Ultimate Pawn The MC gets 2 step-sisters, 1 it turns out to be the Demon lords daughter and the other a loli succubus while the MC wields a magic sword comes from a Hero Tribe.

The Succubus performs a Master and Servant Contract on the two so they can locate each other, however a mishap occurs and he's her master instead and if she were to deify or mistrust him, the contract inflicts an aphrodisiac effect and gets her aroused. The only way to settle her is by making her climax via massaging her erogenous zones, this is later done on other girls and yes the also get power ups through this action.