rule 34 after urethral ambiguous gender ambiguous species anthro bladder egg implantation bladder inflation bladder oviposition bladder penetration close up duo egg implantation gaping gaping urethra genital close up genitals hdyly internal lizard male maleambiguous male only monochrome oviposition ovipositor penetration penis penis close up prostate penetration prostate stimulation reptile scalie sepia sequence sex stomach bulge tapering penis tentacle tentacle in penis tentacle ovipositor tentacle penetration tentacle sex thrusting urethra urethral urethral bulge urethral egg implantation urethral oviposition urethral penetration 8540596