Rule 34 Dev - 2boys anal athletic athletic_male balls bioluminescence cum cum_while_penetrated dark_nek0gami diphallia diphallism duo gay human interspecies male male_focus male_only monster_boy monster_on_male multi_genitalia multi_penis muscular muscular_male orgasm penis penis_tail scalie sex snake snake_penis tail tail_penis tentacle tentacle_on_male tongue unusual_penis yaoi|743994720