2girls, artist_name, bare_back, bare_shoulders, barefoot, black_hair, blush, breasts, cleavage, grin, hand_on_another's_cheek, hand_on_another's_face, hand_on_another's_knee, hoshizora_no_shita, interspecies, looking_at_another, mermaid, monster_girl, multiple_girls, no_pants, original, red_hair, rock, shirt, sitting, smile, thighs, yuri