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1boy abs anal_insertion ball_crushing balls bara being_watched biceps blush blushing bondage bound boy_rape brown_hair captured cbt clipboard cock_and_ball_torture crying cum cum_while_forced cum_while_penetrated cum_while_restrained destor777 dildo dildo_in_ass dildo_nodules eight_pack electrostimulation erection experiment forced forced_orgasm forced_yaoi fucking_machine gay helpless human human_only injection labcoat laboratory lactation male male/male male_lactation male_on_male male_only male_penetrated male_rape_victim male_urethral_insertion milking milking_machine mouth_open muscles muscular muscular_male needle nipple_clamps nipples no nude number_tattoo onomatopoeia open_mouth pecs pectorals pink_dildo rape red_body restrained science scientist screaming sex_machine sex_toy shouting sounding syringe test_subject testicle_expansion testicles thighs torture torture_chamber urethral urethral_beads urethral_insertion urethral_sound vulnerable yaoi

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