3boys angry artist_request bdsm belt bondage bound bound_penis bound_wrists chains clenched_teeth clothed_on_nude collar cum cum_in_container doctor experiment glasses gloves hook insertion lactation latex male male_focus medical milking multiple_boys nude nurse object_insertion orgasm_denial penis penis_milking rape red_hair restraints scientist sounding strapped_down surgeon teeth tied_penis uncensored urethral_insertion yaoi