erection ejaculation anus anal duo avian canine bouncing_penis cowgirl_position bouncing_testicles anthro_on_anthro anthro_penetrated anthro_penetrating anthro_penetrating_anthro bodily_fluids anal_orgasm ejaculating_while_penetrated star_fox fox_mccloud falco_lombardi anthro_pov anthro_on_bottom anthro_on_top cumming_together analysis