undyne, undertale, absurd res, hi res, simple background, 2025, abs, animal humanoid, anthro, aquatic, aquatic humanoid, big breasts, blue body, bodily fluids, boss monster (undertale), breasts, cowgirl position, duo, erection, eye patch, eyewear, female, female penetrated, fish, fish humanoid, from front position, genital fluids, genitals, hair, hands behind head, human, humanoid, interspecies, kristhianquint4, male, male/female, male penetrating, male penetrating female, mammal, nipples, non-mammal breasts, nude, on bottom, on top, penetration, penis, pubes, red hair, red pubes, sex, sharp teeth, smile, sweat, teeth, undertale (series), vaginal, yellow teeth,

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