Pilgrim Quest
The realm of sinful pleasures has the appearance of a medieval but magical fantasy world and lies within the mysterious H-space. The realm is ruled by Ashara, the goddess of lust. Although she is called a goddess, it is believed that she is a powerful succubus of the highest order. Thanks to the goddess and different from the rest of H-space the realm has noticeable elements of a working social structure including different villages for humans. Outside in the wilderness sex demons hunt their prey, but within the villages life is fairly safe, as long as the population worships the goddess. Settlements who can't satisfy her needs, loose their protection and get destroyed, while the residents will be abducted by sex demons or sold as sex slaves.
Worshipping the goddess means feeding her with sexual energy. As with most sex demons, maximizing the sexual energy of their prey through constant arousal and denial before bringing them to the sexual climax is an important part of the feeding process. It is no wonder, everything in the realm is centered around lust and sexual desires. The order of the goddess teaches how to improve cum production in the population and sex slaves are freely available for sexual intercourse to everyone or forced into an endless series of orgasms.
The constant flow of sexual arousal and cum attracts all kinds of sex demons from the H-space into the realm who will hunt their prey in the wilderness. Every traveler should be prepared to resist their allure as long as possible, because sex demons will most likely kill them during the feeding process, usually by sucking their whole soul out in a big last orgasm.
Your role in this world will be that of a pilgrim for the goddess, starting a holy pilgrimage through the realm of sinful pleasures. Your soul is bound to the goddess and as pilgrim you're not allowed to cum without her permission or outside her ancient rituals of worship. You will experience erotic visions while exploring the wilderness, keeping yourself constant at the peak of arousal and filling your body with sexual energy. You will fulfil quests for your goddess and encounter sex demons who will try force you to cum for them instead for your goddess. If you survive your adventure long enough you will become worthy enough to start ancient rituals in which you will feed your goddess with your cum as she pleases.