Goth girl edging JOI with cum countdown

Hello there little slave. You've been good to your master recently so I thought I'd let you cum finally. But it's not going to be easy. let me take me to the brink of orgasm before making you stop. How many times can you take it until you blow your pathetic load? If you can last that long, let me count down from 10 and tell you exactly when to cum. Don't cum too early or you mistress will be very very mad.