First Semester Portfolio- Piece I would like to revise

Just then a very devote servant of Ambrose appeared. He was dressed as richly as any of my cousins (although he was a good deal older), but the way he spoke to Ambrose it was clearly evident that he was a servant.
“M-m-m-aster…” He stuttered, as if he were terrified of the young man that stood in front of him.
“Yes, Helio?” Ambrose asked politely acting as if he were completely oblivious to the servants stutters.
“Y-y-our h-horse i-s-s r-ready s-sir.” He answered.
“Thank you, Helio, you may bring her to me…please” Ambrose asked quite politely.
I watched this whole exchange with a slightly bemused expression. I could tell that the stuttering was all an act. Whether the act was for my benefit or Ambrose’s I couldn’t tell quite yet. Helio gave it away when he winked at me behind Ambrose’s back and that he seemed to stutter almost every word, which was unusual. Still, was the act a attempt of Ambrose’s to impress me or all of Helio’s doing, letting Ambrose go under the illusion that he was in charge and was a overbearing master. Either way those two were going to make this quest, well, interesting.
Helio left us and went to bring Ambrose his horse, jostling everyone in his way while doing so. Ambrose jumped up on the horse in one fluid movement. Even I was impressed by that.
“Are you coming or not?” He asked from his perch… Way up on that horse.
“All the way up these?” I really didn’t have any fond memories of the last time I got on a horse with him.
“How else do you expect us to finish this quest in both our lifetimes without one?” Ambrose asked. He was clearly laughing…at me!
“I don’t know… Walking?”

This piece is a small excerpt of a fiction book that I am writing. It is told through the eyes of a teenage girl back in Ancient Greece who is going on a quest to see if she is really the daughter of a goddess. In this section she is arguing with her new found friend about modes of transportation, and watching an exchange between him and his servant. To be quite honest I don’t know where I got the ideas, they just kind of popped into my head. If I were to revise this piece I would clean up the grammar and us more smiley face tricks/imagery. I want to do this because I am trying to make it the best that I can.