Dеrp said:

Could be, but even then I doubt it'd be possible in reality to force any kind of fluid all the way through the GI tract this fast, if at all, because the pressure would constrict parts of the intestines. They're full of curves and twists and are bundled in a limited space. Yeah, in reality… but sometimes, realism isn't the goal. I guess it's best not to question or think too much about works like this.

i know that, but in theory it might work only because the mouth, stomach and anus are all connected. now i know that there is no way this would have actually be able to happen without serious damage to her. but my answer was to the question, how is this physically possible? anal being the only possible way that cum could be forced through the body and out of her mouth.