I was woken one day by the noise of the shower running. Since it was the weekend I decided to stay in bed and take care of my morning erection. After pushing my pyjama bottoms down around my thighs I slowly stroked my penis, enjoying the sensations as it swelled and stiffened to a full erection.
I'd been masturbating in bed under the covers for a few minutes, the noise of the shower running in the background, when I heard three short cries: 'oh oh oh!' followed by the shower being turned off. My mom had just brought herself off in the shower!
Still masturbating, I excitedly (and somewhat guiltily) imagined my mom naked in the shower, directing the spray from the shower head between her legs until she climaxed. Feeling myself close to orgasm I pulled up by pyjama bottoms, stretching the waistband over my throbbing erection and rapidly pumping hand. My body spasmed and with a moan of my own I came hard in my pyjamas.