The Knight and the Prince's Secret Night (Kishi to ōji no himitsu no yoru) [Pink Shark]

A devoted knight offers his powerfully muscular body to fulfill his beloved prince's secret, urgent wish, turning a vow of service into a night of intimate surrender. When a dark curse awakens, the knight's flesh erupts with slick, writhing tentacles that coil around the prince's own toned form, dragging tender devotion into overwhelming, monstrous pleasure. Trapped between fevered incantations, crumbling castle walls and desperate, sweat-slick embraces, the two must surrender to a ravenous bond that blurs duty, magic and anal ecstasy.