Saw Her in the Jacuzzi

My gym has a sauna/steam room/jacuzzi where all the women are usually naked and walk around freely. I was lounging in the rest area of the jacuzzi and was just relaxing and reading a book while I cooled off after exiting the sauna. It was a Sunday so the gym was pretty empty, I noticed I was alone most of time and I was thinking to myself, 'too bad I don't have the courage to masturbate in public because this would have been the perfect opportunity.' Anyway, as I was reading my book, a woman came in, naked, and she slowly stepped into the jacuzzi. She was not very friendly, she didn't smile when I smiled at her and she tried to avoid eye contact with me all together. I ignored her and continued reading when several minutes later, I noticed she had her back to me and she was sitting directly in front of one of the jets in the hot tub. She had one arm up over the side of the tub and I noticed that her legs were spread under the water positioning her crotch in front of the stream of bubbles coming out from the jets. She must have gotten caught up in the moment because even though I couldn't see her face she was making heavy breathing noises and I saw her rocking her body rhythmically in the water. She was in front of the jet for about 5 minutes when she finally yelled a loud 'Oh!' and she suddenly turned around and saw me watching her. I was mesmerized and embarrassed at the same time. I could tell she was embarrassed as well. Her face was flushed and she knew that I knew what she just did. She sat in the water for maybe another minute then she finally emerged. I looked at her pussy and it was swollen with her clit showing. She was not attractive, slightly heavy, had cellulite and dark brown pussy hair, but watching her get off in the jacuzzi somehow made her extremely sexy...