This fourth installment of “Self-Gratification is Evil!” features hardcore masturbation that is so intense it's almost grotesque. Multiple fingers are inserted, dildos are swallowed, and close-ups reveal cloudy genitalia, accompanied by deep moans that seem to emanate from the depths of the earth. This is “Guro Ona” (a.k.a. “Grotesquely Extreme Masturbation”). Akane Morita, a slender lady, engages in finger masturbation with a steady stream of cloudy precum, using a magic wand, rotor, and cucumber insertion. Asuka Kirishima, a voluptuous mature woman, performs powerful Guro Ona, swallowing a carrot and even using a machine dildo for a surprisingly hilarious Guro Ona. Shiori Aizawa, a pure-looking mature woman, reaches her limit with finger masturbation and a thick carrot insertion, quietly but surely reaching climax. Azusa Katagiri, with her loose and grotesque pussy that squirts from mere friction, uses fingers, vibrators, vegetables, and even a penis, all leading to squirting Guro Ona.