rule 34 1boy abs balls ballsack bara big muscles big pecs cock ring cum demon slayer flexing arm flexing bicep foreskin foreskin folds hand on thigh hoybarartist humanoid humanoid penis intact kimetsu no yaiba large penis male male nipples male only male pubic hair muscles muscular arms muscular male muscular thighs nude male pecs penis precum red eyes scrotum semi erect serratus serratus anterior sitting on ground smooth skinned male solo testicles uncut unretracted foreskin uzui tengen veins veiny arms veiny penis white hair 8570205