Got Weak On My Mom...

First of all: I feel ashamed for what I did.

My mom is working as a nurse at a hospital. Most of the staff is ill at the moment and she is working her arse off right now.

She came home of her second 24h shift this week. I cooked for her and we ate. She was completely exhausted. We sat on the couch and she fell asleep next to me maybe 2 minutes later. I kept watching my series, still next to her. We kinda spooned. No bad thoughts.

To myself: I am trying to avoid porn ect at the moment. Get my mind clear and try to not masturbate for a while, it was only the 5 day but I was kinda horny all the time. But i really wanted to finally get away from porn.

Now to the real point. Around 10 minutes or so she was softly moaning in her sleep. She must have had some wet dream. I felt uncomfortable at fist. It went on and she released another moan. She was now heavily breathing and softly moaning on every three or four breaths. It was making me so aroused. I couldn't help myself. Took over my brain. I pressed myself against her.
Grinding against her. Softly. I let my left hand feel her crotch. Then beneath her shorts, managed to touch her vagina, put a finger inside her, felt how wet she was...

I could swear that I was smelling her arousal. It didn't took my long and I felt my orgasm. I just let it happen. My mom still softly moaning in her sleep. I came in my pants like never before.

I stayed next to her. Slowly getting back to my senses. Ashamed I moved my finger out of her. She kept moaning for a while until she stopped suddenly.

I went into my room after half an hour. Now I'm feeling abysmal.