Stand in the shadows and watch.

Despite his better urges, Robb found himself standing quietly in the shadows as his naked mother played with herself, one hand tugging on a nipple as her other slipped to the shaved lips of her cunt. It had seemed to Robb from a young age that his mother was a lovely, enchanting woman, and staring at her like this made those thoughts not only leap to the front of his mind but make him do things he had only ever dreamed of in the darkness of night while half-denying it to himself. Almost of its own accord, his hand went to his breeches and loosed them. He began to play with his massive cock, as his mother thrashed in her bath.

"Oh! Oh, yes! Harder! Harder!" she groaned, all while her eldest son jerked off to the sight of her naked body.