Rule 34 Dev - alphys arched_back black_and_white blush breasts buckteeth chubby closed_eyes collarbone dialogue duo ear_fins ear_frills embrace english_text eye_scar eyewear female fin finger_fuck fingering fingering_partner fish frill gills glasses humanoid line_art lizard looking_at_another looking_at_partner marine monochrome multiple_positions nipple_pinch nipples nude open_mouth pinch pixylbyte ponytail reclining reptile scalie scar sequence sex sharp_teeth side_view sitting small_breasts speech_bubble sweat teeth text thick_tail undertale undyne vaginal_penetration video_games yuri|3565205440