As she made up her mind, she started subconsciously wiggling her toes up and down in her sandal. Jason, sensing danger, started to back away, limping. Surely was wasn't contemplating doing... that? He didn't want to even consider she'd do that. He watched her foot, her slender toes moving up and down, revealing the soft pink underside of them to him.
The sound of her voice bought him back to his senses. "Well Jason, as you're of no use to me here, you're as good as dead anyway. You're a cripple, and you'll just slow my progress here. I broke your leg simply by standing on it, I can break the rest of your body by standing on it - see it as me putting you out of your misery... a bit like a bug. She giggled slightly at her comparison.
Jason started to hobble away as fast as his broken leg could carry him, but Tanya wasted no time. She used the toe of her sandal to knock the crippled boy over, and them covered him with it. She rested her foot gently on top of him for a bit, and she could feel his squirming under the sandal, tickling the bare sole of her foot resting on the other side of the sandal just above him - she quite enjoyed the sensation of being on top of him.
From Jason's perspective beneath, it was not quite so amusing. His broken leg was contorted in an awkward position by the bottom of her sandal, causing him to convulse in agony (this was the squirming she could feel under her foot). He couldn't believe that a girl several years younger than him, and smaller than him normally, would now be ending his life painfully, for her amusement beneath her as she stood happily on top of him. The bottom of her sandal was also still very wet and causing even more discomfort, as the sun hadn't been able to reach here. As this thought entered his head, the small space he had under her sandal started to lessen. "Oh God", he thought, "she's doing it". The rough wet bottom of her sandal pressed painfully onto his chest, and the pain in his leg causing him to spasm even more. He could no longer breath due to the pressure of Tanya's body weight. He felt her foot above him adjust slightly in the sandal, and he realised at this point how worn and thin the sole of her sandal actually was. If he could feel her foot, she could feel him - and was most likely enjoying it, while he suffered. Before he even had change to feel even more angry about this, he felt her foot adjust again with his pain, and his chest caved in. Still alive, he felt the wet gritty sole of her sandal pressing and contorting his face beneath her toes. Even with the almost unbearable pain in was now in, the pain surged to unimaginable levels, every second or so for a millisecond - like his body was being pumped. He didn't realise this was due to Tanya raising and lowering her toes just above his head causing her sandals sole to effectively pump on his broken body slightly.
She drew it out as long as possible, but Tania got bored quickly. The enjoyable tickling sensation his convulsing body had caused the sole of her foot to feel had now stopped. She finally transferred all her body weight onto his fragile body and felt a final crack beneath the ball of her foot which caused a giggle to escape her lips. As she lifted her foot, she had to shake it slightly to dislodged his body from the bottom of her sandal.