undyne, undertale, simple background, sound effects, transparent background, 2023, alpha channel, animal humanoid, ass, athletic, athletic female, bangs, big breasts, big butt, blue body, blue skin, bra, breast expansion, breasts, breath, clothing, ear fins, expansion, eye patch, eyeshadow, eyewear, female, fin, fish, glistening, glistening body, glistening skin, guydude01, hair, huge breasts, huge butt, humanoid, hyper, hyper breasts, immobile, looking pleasured, looking up, lying, makeup, marine, marine humanoid, monster, motion lines, nipples, nude, on front, panties, panting, pink bra, pink clothing, pink panties, pink underwear, ponytail, pupils, red eyeshadow, red hair, red nipples, red sclera, sharp teeth, slit pupils, smile, solo, solo focus, teeth, undertale (series), underwear, wardrobe malfunction, yellow teeth,

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