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alternate_universe anthro ball_inflation balls_expansion belly belly_expansion big_breasts bodily_fluids breasts catty_cattenheimer cum cum_inflation cum_inside darkgalgani domestic_cat duo expansion eyewear feet feet_up felid feline felis female genital_expansion genital_fluids genitals glasses gynomorph gynomorph/gynomorph hindpaw impregnation inflation intersex intersex/intersex mammal nerd nude open_mouth overweight overweight_female ovum ovum_with_face paws penetration penis ribbons selfcest sperm_cell sperm_cell_collision spinswap square_crossover testicle_impregnation testicular_pregnancy undertale_(series)unusual_pregnancy urethral urethral_penetration wide_hips