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Embarrassed, I'm caught mid-masturbation by my stepmom, her eyes widening as she spots my massive, throbbing cock. I freeze, my hand still gripping my shaft, as she watches me stroke my length, my pre-cum glistening at the tip. I quickly try to cover up, but she insists on watching, her breath hitching as I resume my rhythmic motions. She asks if I'd like some help, her voice laced with desire.