2boys, ^_^, back, bare_back, blue_eyes, blue_hair, closed_eyes, fins, hasegawa_langa, head_fins, kyan_reki, male_focus, merman, monster_boy, monsterification, multiple_boys, muscular, muscular_male, navel, open_mouth, orange_hair, short_hair, sk8_the_infinity, topless_male, uppi, yaoi