Majo no Mugen Kairou

In a sword & sorcery world, the magician Rizette and warrior Rena set out to save the captured princess from an evil witch. However, they fall under the curse of the witch, and are send to and trapped in a hellish dimension known as "The Witch's Endless Corridor"! They must escape if they are to fulfill their duty, but first, they must deal with violent monsters, rape, and forced orgasms! Every hole in their body, even their noses are violated to the max, and the allure of sexual pleasure floods their minds. They try to resist the power of the climaxes, but their faces and moaning screams can't hide their enjoyment! They must advance forward to defeat the witch, but it feels like they aren't progressing anywhere, and the violation doesn't stop. Does anything but despair await these two, who are caught in a loop of climaxes?