Hey there, I'm reviewing for HSP Erotic Language class. this review is meant to help, not to harm.
For this assignment, you were asked to write a couple of paragraphs based on the prompt available. You've done well completing that.
The erotic part of your story was well written and descriptive. Your porn paragraph was fast-paced and showed what you know well.
When you write your stories, I recommend you picture the scene in your mind and watch it unfold in detail. You have a part of this story that doesn't quite make sense.
I saw her flushed cheeks flash as she jumped on me. Taking a stabilizing step backward, I felt her silky thighs wrap around me, her nimble fingers loosening my belt. I felt a quick jerk and my pants were open.
This is where it doesn't make sense. She jumps up, wraps her legs around him and undoes his pants, while he's holding her? You might mention he placed her firmly on the ground and add fierce kiss as her fingers roamed down my body loosening my belt and unzipping my pants.

You've done well for your first lesson. Thank you for sharing. Keep writing.