Rex jumped on me

As quick as lightning Rex jumped on my back, shouting: “Go horse go!!”. And with that he was using my shirt as reins and kept pulling it up my back, kicking my sides to make me ride with him on my back. “Get off my back Rex!” I shouted at him, but my panic made him even more determined to ride my back. Waving my shirt, at least, Rex had a good sight of my white lace bra and my pale skin. In effort to get Rex off my back I tried to straighten my legs so I could slid him off my back, but I was wrong....