physics of sex

a girl is fucked in her butt by a guy
her anus is tight around his cock
she squeezes her anus around his cock
when his cock needs to ejaculate
then she sucks on his cock as much as she can
until his cock ejaculates in her mouth 
and she swallows his sperm 

physics: 
girl squeezes her anus around his cock 
that creates pressure around his cock
girl sucks on his cock 
that creates vacuum around his cock
the change from pressure to vacuum
intensifies the sexual pleasure for the guy
and the girl feels she controls him through pleasure
she can control how intense pleasure he feels
and she can try to control when his cock ejaculates

hint:
if the guy lies down on his back
and the girl squats down as she sits on his cock
then that will enable her anus to squeeze tighter around his cock
but the girl will have to be sure that she has defecated in toilet before
because when she jumps off his cock to suck on his cock
then feces could leave her butt, if she still has feces in her intestine
if she has a strange feeling in her rectum
then she could lie down to the side while the guy rolls to the side 
so that he can carefully pull out his cock from her butt

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