Miss July has three pairs of boots with spikey high-heels, she wants to try out them... on her slave ;-)
She uses her slave as her seat while she puts on the first pair, overknee boot with 5" heel.
The she steps on him, feels like the heels drive in his flesh, if she shifts a little weight on it.... and offcoarse the slave screams.
She replies this procedure with every pair until her carpet-slave sound like he is destroyed.