Andrew slipped the slim vibrator into Kath's willing arsehole, then as she lay on her side he pushed his cock into her juicy pussy.
"You love two at one, don't you, you tart?"
She just moaned in pleasure as with his hand he turned up the revs on the vibro inside her back passage and pushed deep with his own cock into her cunt. She loved the sensation of double penetration and as he pumped away at her, she could feel the orgasm welling up inside her.
"I'm going to cum soooo much!" she said.
Andrew continued to fuck her with his cock, but pulled the vibrator out of her arse, knowing full well that doing that would take Kath over the edge.
"That's fucking great," she said and her juices flooded from her, soaking his cock and the bed.
Afterwards they just lay there hugging each other and Andrew kissed Kath tenderly.
Suddenly Kath pulled away and looked him straight in the eye.
"Have you noticed the way Jenny has been outrageously flirting with you recently?"
Andrew felt a tight knot develop in his stomach.
"Not especially, no," he lied hoping he sounded convincing.
"Well you must be blind and stupid and not the horny bastard I thought you was," Kath told him, "I was thinking of having a word with her, because she seems to be walking round in her underwear just a bit too often, especially when you are around. Do you think I should?"
"You're her Mom, you have the right to tell her how to behave in your house even if she is 18, but as I said I haven't really noticed."
"I think you might be lying to me darling. Take last Sunday evening, we were watching TV and she came through to get a drink. She was just wearing a pair of white panties and a white lacy bra. I know you pretended to ignore her, but I saw the little look you gave her, staring right at her arse as she walked past."
Andrew ran his hand over Kath's bum and started to kiss her neck in the hope it would take Kath's mind off the subject of Jenny.
"This is the only arse I have eyes for," he said, but even to him it sounded limp.
"Yeah, right," Kath said, "Knowing you as I do now, I bet it is her arse you are thinking about when you are wanking in the shower."
"Kath, darling, forget Jenny, how about we watch a group sex porno, then you can tell me what you'd like to do with those young guys cocks, how you'd like to suck one whilst another fucked you from behind."
"Maybe later, tell me first if you have ever jerked yourself off thinking about my daughter?"
"Look okay I have noticed her walking around with next to nothing on, but she's 18, I'm 47, she's hardly doing it for me is she? Okay she's got a nice young body, but I prefer the more mature lady, like yourself darling."
"So is that a yes or a no when it comes to wanking in the shower?" Kath asked again raising her eyebrows at him. "Look I know how horny you are, I don't mind if you admit it, honest? In fact I would be totally shocked if you said you had not thought of it once."
Andrew wasn't sure what Kath wanted, the talk was turning him on and he desperately wanted to tell Kath everything, but what if it was just a trick and when he told the truth how did he know she wouldn't go ballistic?
"Okay so perhaps I have, but I can't think of specifics," he relented.
"That's a strange answer," Kath said "Surely if you have, you must have been thinking about her tight little arse and pert tits and what you'd like to do with them."
"Probably."
"So have you jerked off thinking about her this week?"
Andrew thought back to just 4 days ago when Jenny herself had been in this bed and he had fucked her several times in several different positions. Since she had turned 18 just a few weeks back, they had fucked virtually every week, and Jenny had been absolutely amazing. She had gone from step daughter to teenage whore, ready and willing to do anything including acting out all his perverted fantasies, some of those including Kath, her Mom.
"4 days back, so before Sunday, I admit to fantasising about your daughter and having a wank. Is that what you want to hear? Okay she has been flirting and I have noticed, which is why I did it."
"Tell me," Kath said. She lay back with a broad smile on her face, "Tell me about your wank!"
Andrew was so hard, he loved it when Kath talked dirty and told him all the things she loved and wanted sexually. He never got jealous when they watched porn together and she told him how much she'd love the young studs in the movies to fuck her cunt and arse and cum all over her. In fact he actively encouraged it and had once even tried to get her involved in a threesome with another guy, but she had refused at the last minute and they had made do with the fantasy instead. Now she wanted him to talk dirty about her daughter, someone he knew very intimately.
"Well it's simple really, I was in the shower and I got this mental picture of Jenny in my mind and just jerked off."
"What was she wearing in your picture?"
"Underwear."
"Describe her to me."
"Jenny was wearing a white lacy bra and I could see her dark nipples through the lacy material and she had on a little pair of white lacy knickers and I could see clearly that she had shaven off her pubic hair and there was a little damp spot where her pussy had started to leak a little."
"Did you pretend to cum all over her?" Kath asked.
Andrew noticed that her right hand had wandered down to her pussy and she was slowly masturbating as he talked.
