Rule 34 Dev - 1boy ana anal anal_insertion anal_probe barefoot bondage bound_arms bound_legs bound_wrists box boy_rape catheter cock_and_ball_torture experiment feeding_tube force_feeding forced_yaoi gag gagged glare in_container laboratory machine male male_only male_urethral_insertion malesub monochrome penile_insertion penis penis_milking person_in_a_container probe rape restrained science solo straps tank trap tube tube_gag tube_in_ass tube_in_penis tubes urethral urethral_insertion yaoi|1106056360