His mom's underwear makes the perfect prop

Yeah, he was going to jerk off over those photos on his dad's phone. But he went into his mom's chest of drawers first.

In the top drawer, she had an assortment of underwear. Somehow, Matt had pictured his mom wearing boring cotton briefs... he'd been wrong--every set of panties was a thong. Her bras were a little more substantial which, when he thought about it, made sense. With the weight of his mom's big tits, she'd need serious support. He grabbed a black thong and a black bra out of her drawer, laid down on his parent's bed, flipped the phone to the picture of the two women doing it, and wrapped the bra and panties around his dick.

It only took him a couple of seconds before he was ready, but first he had to decide what to do with his semen.