FURVERT!

abdominal_bulge anal anal_knotting anal_penetration animal_genitalia balls bed birefringent_fur chromatic_aberration collar dominant duo erection feet feral fully_sheathed furniture genitals haswell hi_res iridescent iridescent_fur knot knotting larger_dom lying male male/male male_penetrated male_penetrating male_penetrating_male mammal membrane_(anatomy)mustelid on_back otter otterlike pawpads penetration penis rainbow sex sheath sheathed_while_penetrated size_difference size_play solo_focus spread_legs spreading toes tongue webbed_feet webbed_hands