abs anthro biceps blush brother brothers bulge clothing duo grinding incest_(lore) locker_room male male/male muscular muscular_anthro muscular_male navel nipples quadriceps sibling sweaty translucent translucent_clothing translucent_underwear triceps tuft underwear wet wet_clothing bird_dog canid canine canis domestic_dog golden_retriever hunting_dog mammal retriever hi_res
After a tough workout, the older brother has an idea one one last exercise he and his brother can do in the shower.