Rule 34 Dev - 2_penises anthro anus backsack balls barely_visible_genitalia barely_visible_penis beaker big_penis blush bodily_fluids book bottomless butt casual_nudity clipboard clothed clothing coat diphallism duo erection eye_contact eyewear fin floor furniture genitals goggles hair head_fin horizontal_diphallism imminent_sex inside lab_coat laboratory laboratory_equipment laboratory_glassware looking_at_another male male/male multi_genitalia multi_penis nipples penis ponytail poster raised_tail rear_view science scientific_instrument shark_fin shark_tail sitting stool swallowing sweat table tail tile tile_floor topwear working thericegoat lysander_hano zadok_the_shark blacktip_reef_shark carcharhinus fish marine reef_shark requiem_shark shark absurd_res comic digital_media_(artwork) hi_res shaded|15195428080