Inma no Shiro ~Bakunyuu Succubus no Yuuwaki to Kyuusei~

At the end of his long journey, the hero arrived at the demon castle as foretold. There, a phalanx of curvaceous succubi appeared, whispering their siren song. "Forget your world. Be with us, take your reward." The hero knew he mustn't be tempted, but those voices... those curves...