FURVERT!

absurd_res anthro bodily_fluids dripping duo expansion femboy genital_expansion genital_fluids genitals growth hi_res injection knot male male/male mammal medical_instrument medical_syringe murid murine penetration penile penile_penetration penis penis_expansion penis_in_penis penis_size_difference precum precum_drip rat ratboy ratdraws rodent scientific_instrument sex syringe transformation transformation_mechanism transformation_sequence urethra urethral urethral_penetration