anthro belly big_belly bodily_fluids cum cum_in_nipples deep_navel duo erection genital_fluids genitals hi_res male male/male male_penetrated male_penetrating male_penetrating_male mammal marx50 marx50_(character) monochrome murid murine navel navel_fetish navel_penetration nipples obese overweight penetration penis penis_in_navel rat rodent sex size_difference unknown_species
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