Maria was sitting on the couch late at night next to her son. He was on her right side. He was kissing her neck, and feeling her up, rubbing her closest thigh, putting his right hand on her thigh, moving toward her inner thigh and slowly rubbing upward, up to her pantied crotch.
This hot, sexual fondling led him to lower her unbuttoned jeans to her knees. He'd unbuttoned her pants, reached in and rubbed her panties. Maria was allowing her son to feel her up sexually after they had engaged in a little light wrestling.
Maria had previously been standing over her son who was laying on the ground. Her legs scissoring his right leg, trying to take charge by twisting his foot. As they playfully engaged in this, Maria began to feel horny. With her son's leg between hers, and him twisting and turning into her and away from her, this had the effect of stimulating her clitoris, which she realized was arousing her sexually.
Her son realized she was getting sexually aroused and his heart began beating wildly. His mother was clamping her legs together more tightly the more he struggled. It was plainly apparent. His mother was humping his leg! She was getting sexual gratification from him!
Events leading to this moment had started a few years previous. She'd been divorced a number of years and hadn't dated at all. She kept to herself leading a quiet life of television and reading. Her 18 year old son had been noticing her as of late. He'd been noticing her in a sexual way.
He'd stumbled upon some old Family Letters magazines at an adult book store he discreetly visited and bought a few issues. They were full of mother-son sex stories. At first it was a little off-putting, being more puzzled than "turned-on," but the more he read the Mother-Son sections, the more aroused he got, and this is when he began watching his mother around the house.
She'd come into his room cleaning while he read on his bed and he'd watch her bending over. Her ass was a hot, chubby, motherly ass, and it thrilled him to see her pantied ass cheeks peek out as she bent over to pick things up in his room as he lay there.