.....she's either bored with giving the blowjob or she's angry.....
If she's bored: take her shopping afterwards.....or you better be good at eating pussy,
If she's pissed off: take her shopping afterwards.....or you better be good at eating pussy....or, if you really fucked up, RUN....!
Click this link to explore a trail of others who don't have that "poker face":
https://pimpandhost.com/p/if-that-s-the-face-she-makes-117599