FURVERT!

5_fingers abstract_background alphys anal anthro anthro_on_anthro anus aquatic big_anus big_butt blue_body blue_fingernails blue_nails blue_skin blush blush_lines bodily_fluids breasts buckteeth butt butt_focus colored_nails duo eyelashes eyes_closed eyewear female female/female female_anthro female_rimmed female_rimming female_rimming_female fin fingernails fingers fish freckles glasses gnauseating hair hand_on_butt head_spikes hi_res humanoid interspecies long_hair long_tongue looking_at_another looking_at_partner looking_down looking_pleasured lying nails narrowed_eyes on_side onomatopoeia open_mouth oral pink_anus ponytail red_hair reptile rimming saliva scalie sex side_boob simple_background sound_effects spikes spikes_(anatomy)spread_anus spread_butt spreading sweat sweatdrop tail teeth text thick_tail thick_thighs tongue tongue_out undertale undertale_(series)undyne yellow_body yellow_sclera yellow_skin