Pamie was jacking Billy off!

Susan knew that without a doubt.

Her pulse leaped and raced with excitement. The thought of reaching across her daughter's lap to make certain was strong, but she resisted. There was enough evidence in the way Pamie's shoulder moved.

Placing her hand between Bob's thighs, Susan cupped his balls and cock again. But Bob, no longer seeing any reason to be so secretive, slipped her hand under the leg of his trunks. Susan fondled and squeezed his balls, feeling his cock grow very hard. As she wrapped her fist about his cock once again, she felt his hand sneaking up between her thighs. With a shiver, Susan opened he legs to give him access to her crotch.

This is crazy, she told herself. Here I am, sitting in this hot tub, jacking one of my sons, letting him feel me up, while my daughter is jacking the cock of my youngest son. And look at us! Each trying to keep it concealed from the other! Insanity, that's what it is, sheer insanity.

Bob rubbed at his mother's cunt, pressing hard, and Susan began to grind at his palm slowly. She clung to his hard cock with tightness, moving her fist up and down, wondering if she could make Bob come off again. In her mind, she was watching Pamie's small fist jacking on Billy's cock, and the image increased the fiery heat between her thighs.

All four were leaning their heads on the deck now, pretending nothing was happening.

Then she heard the choking gasp from Billy, accompanied by a giggle from Pamie. With slitted eyes, Susan saw Billy's come juice float up in strings. She had not been wrong Pamie had jacked Billy off. With her breath held in, she jerked her fist swiftly on Bob's throbbing cock and felt him spurt in rapid, spewing spasms. She had made him come off again, and as he came, his hand rubbed fast and hard at her cunt. Susan couldn't stop the whimper as she tame, couldn't stop the grinding motion of her hips. Her eyes rolled in her head, every part of her body seeming to explode with an amazingly sweet orgasm.