Daphne diced the onions, humming a made up tune to herself. She finished with the onions and started on the capsicums, when she heard a thump upstairs. She knew her son, Jacob and his girlfriend Natalie where home, and assumed the noise had come from them. They had arrived from her house about 20 minutes ago, and said they were going to watch a movie, although when she was a teenager that was code for something quite different. She trusted her son, though; after his father passed away a few years ago he had really began opening up to her, telling her a lot of details about his personal life.
Another thump bought her out of her memories of her youth, followed by a yelled "ow!". She started to get a bit worried when another yell came from upstairs. She quickly rinsed her hands and dried them on the tea towel before hurrying upstairs to investigate. As she ascended the stairs she could hear muffled talking, followed by a giggle. She paused, thinking that maybe nothing was the matter, when she heard it.
A moan. A long, drawn out moan. A mans moan, and one of pleasure. She held her breath, unsure of what to think, when she heard it again. She snuck up to the door, without knowing why. Her body seemed to be moving independently of her mind which was screaming to go downstairs and finish dinner, and quietly she laid her ear against the door.
She could hear quite easily now. She heard her son panting, and sometimes moaning. "Deeper," she heard him whisper "Yeah, like that." She could hear Natalie moan too, although it was a muffled sort of moan. Without realizing it, her fingers grasped the doorknob and without a sound, she turned it and slowly pushed it open.
What she saw raised a lot of emotions and feelings in her. It took her a second to realize what she was seeing. Her son, her only child, was completed naked and bent over on all fours on his bed. Natalie was only wearing a thong, and was behind him with her face buried in his rear. She was flicking her tongue in and around his asshole, and he seemed to be really enjoying it. She was standing behind them, so they hadn't noticed her yet. She felt her pulse quicken, and one of her hands slowly found its way to her own breast.
She didn't know what she was thinking, but she slowly slid her hand under her bra and lightly rubbed her nipple. She was being aroused by her son and his girlfriend have sex, she realized, but didn't care. It had been a while since her husband had even looked at her, and she hadn't masturbated since she was in her twenties. She slowly crept her hand down inside her panties and found her clit, and wasn't surprised to feel that her panties were already soaked. She gingerly rubbed her self, before feeling further down and slowly pushing two fingers into her pussy.
"Ooooohh, fuck" She moaned, and instantly she regretted it. Jacob and Natalie sprung up and Natalie squealed. They fumbled with blankets in an attempt to cover themselves, but it took too long and the sight of them from the front made Daphne only more excited. Her son was still hard, and about 7 inches long, give or take. He was completely bald too, and his balls were a lot bigger than his fathers. Natalie breasts were a lot bigger than she thought they would be, with big pink nipples, the size of a 50 cent piece. They stared at her in shock, as she still had her hand down her pants. She thought about pulling her fingers out, but the slightest movement sent shudders through her body. Her son stared at her in shock as she slowly worked them in and out, again and again until near the point of cumming. She pulled them out and walked over to Natalie, slowly pushing fingers into her mouth.