In the heart of the Occult Research Club, Issei's world is turned upside down as he discovers Rias in the throes of passion with an otherworldly creature. The room is thick with the scent of oil and sex, Rias' body glistening as she rides the beast, her long red hair whipping around like a fiery halo. The monster's massive cock stretches Rias' tight pussy, filling her completely as she moans in ecstasy, her voice echoing in the room. Issei's eyes widen as he sees Rias' plans for the beast's creamy offering, a wicked smile playing on her lips as she prepares to mark her territory.