My suggestion is that you read through the story and edit some grammatical errors. As much as they didn't stop the flow for me, I think it's important to correct them.

A few instances that I picked:
Oh my god, he smells amazing. - This is in present tense while the story is in past tense. I'm guessing it is Lizzy's thought. If it is, you can italicize it the way you did with her other thoughts.
With a gasp Lizzy had to bed beg
Look at this line: her ass leaning her against a tree. She rode him If the tree was right behind her, how did she get the space to ride him?

Another suggestion I have is that, when you write what Niccolo did to Lizzy, also write the sensations she experienced. Example: entered her with a hard thrust sending ripples throughout her body. Also, talk about the heat that began rising at her centre the part she lost control.

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