Rule 34 Dev - 2023 anthro balls belly black_sclera digital_media_(artwork) erection fur furniture genitals hi_res horn humanoid humanoid_genitalia humanoid_penis looking_at_viewer male mammal masturbation murid murine musclegut nipple_piercing nipples nude penis piercing rat red_body red_fur rodent slightly_chubby smile sofa solo tail ultra_vermin|8629201176