FURVERT!

2016 anthro athletic bench boxer_briefs boxers_(clothing)bulge butt canid canine canis claws clothed clothing domestic_dog duo erection erection_under_clothing fluffy fluffy_tail furgonomics genitals grey_theme greyscale katarhein locker locker_room looking_at_butt male male/male mammal monochrome navel on_bench partially_clothed penis sitting smile standing tail tail_clothing tenting topless underwear