So, while Triana was learning the joys of male/ female sex from her dad, Selina looked in on Billy. She knocked quietly on his bedroom door, but getting no response, decided just to walk in.

Billy wasn't there.She could hardly believe her own dissapointment. She was so counting on her big stud of a son to fuck her she felt like crying with the thought that it wasn't going to happen. She went to sit on the bed, and, glancing down did a double take: On the sheet in front of her was a big spunk stain. Half tucked under the top sheet was the corner of a magazine. She pulled it out, and saw it was a publication she had never seen . "Virgin Ass". The magazine flopped open to the centre page, and there, in glorious technicolor, was a picture of a really handsome man, fucking a gorgeous blond in her anus. Tucked under her splayed legs was a girl's head, sucking on the blondes vagina. The photography was so good, she could see the veins on the cock, and the red, stretched anal ring. There was spunk oozing out of the cunt being lapped, so either the man was superman, or there was another person off camera.

Already hornry, Selina felt the now familiar wetness seep out between her labia and down the crack of her ass. She reached down, and pushing the leg of her panties to one side, slipped her finger into her snatch. Oh my God, she thought, I am turning into a nymphomaniac. I need to come all the time. Even a picture can set me off.

She was so absorbed by the magazine that she didn't notice Billy standing by the door until he moved. She hurriedly straightened her panties and smoothed down her dress.

"Billy, Hi sweetheart, I'm sorry," she stuttered, " I didn't see you there."

Billy had trouble speaking. "It's OK, Mum, I have just got back. I was having a pee. Please don't stop, I want to look at you playing with yourself"

Selina blushed, "Do you really want to watch me do that?" she asked. It secretly thrilled her to the core.

Bill knew that his Mum was in his room for a reason. He also figured she was horney. And he also knew that here was the opportunity to finally screw his mother.

"Oh, Mum" he gabbled "I want to fuck you."

Selina was on stronger ground now. She still knew that what she wanted to do with her son was considered wrong. Although she desired it, she could at least show that she thought the idea was wrong.

"Billy Richardson" she said sternly, "How can you speak to me like that? I should wash your mouth out with soap."

But Billy wasn't stupid, he knew why his mother was in his room.

"Mum, you were the one frigging yourself. I caught you. You've always taught us to speak openly to you and Dad. Anyway I saw you sucking Triana's cunt - I know you want to fuck me too. Anyway, even as we speak, Dad is having his cock cleaned by Trainas mouth - I expect he'll be fucking her soon. Don't you think we should also be having some fun?" "Oh, Billy" Selina almost whispered " Come here. you bad, bad boy."

Billy came to a stop in front of her.

"You remember how we played the other day, and you squirted your spunk onto me? Do you want to do that again?"

"Oh. yes, Mum. But I also want to fuck you, like Dad is fucking Triana, and I also want to put my prick into your bum hole, and fuck that"

Billy opened the zip on his pants, and freed his cock. It stuck straight out and jerked with a life of it's own. Selina leaned forward and licked the tip. Billy shuddered. She then licked the underside, from his balls to the tip, before sucking his complete member into he mouth. Billy shudderred again.

Selina reached round his buttocks, pulled them apart and placed the tip of her finger on his anal opening.

Billy didn't know whether to push forward and sink his cock into her hot, sucking mouth, or push back to impale his rectum with her finger. Selina made the decision for him. She snaked her finger back to her mouth, wet it liberally, and then, pulling his bum apart again, slipped in her finger. Billy couldn't help it, he pushed into her mouth and squirted the first gush of spunk into her throat. She gagged, and he followed the first up with another stream of white, creamy semen, follwed by another and another.

My God, she thought, this kid is a real fuck juice machine.

Billy pushed her back onto her bed. He knelt down between her parted thighs and looked at her panty covered sex.

"Wait" mumbled Selina. She gently pushed him awa, and reaching down, stripped off her panties. She then lay back on the bed, smiling up at her son. Billt looked her over - he could clearly see the results of her previous encounter

"You've got spunk in your cunt" he remarked "Is that Dad's?"

"Yes, darling" replied Selina.

"Can I fuck you now?"

Even though she was keen to have Billys stiff rod buried deep in her moist pussy, Selina was aware that her son still needed some education in the art of sex. She wanted him to be a good lover - considerate to his partners needs

"Wait darling" she said, "first play with it. Slip your fingers in. and play around. Then rub the little nub at the top."

"Your clitoris?" he asked.

"Yes, baby, my clit. You have to be gentle with it, but if you can learn how to massage it and play with it - you'll have me - hell, any girl, dying to have you fuck them" Billy loved this - hell Sex Ed. at school was never this educational. This was information he could really use. He loved being with his super sexy Mum - wanted to fuck her deep and also try other things he had only read about.

"I want to play with your bum hole, too" he said

" I think we can do that. But you have to wet your finger first and don't touch my cunt with the same finger."

Billy's prick had hardened again. After fingering is mothers cunt and anus he pushed his hips forward impatiently, keen to bury his cock into her. Selina sensed that it was time - and she too could hardly wait.

&OK , stud, fuck me good" she instructed him and opened her legs to receive him. Billy hovered above her and then guided his big hard cock into his mothers slippery wetness. He stroked quickly.

Selina smiled a little at his raw enthusiasm

"Not so fast. darling, take it easy. Fuck me slowly. Let's enjoy it"

Billy obeyed her - damn this was good learning "Oh yes" he mumbled " this feels so good."

He continued to fuck her with long slow strokes. She started to grind her hips to him so that they were working together, allowing his hardness to penetarte deep into her womb. After a few minutes of stroking, he lifted her knees to her chest and started plunging in strongly and steadily.

As much as he loved this - he knew there was something he wanted to try before he spewed his load.

"Mum, I want to fuck your ass, can I?"

Selina was already bringing herself closer to orgasm. Her sons rhythmic fucking and the thought of her husband and daughter doing the same thing in the next room was having a powerful effect on her. It had been a long, long time since Jim had taken her in the ass - she wasn't overly fond of it - but she was keen to help her son realise his fantasies.

"OK, Billy, but you have to go real steady, let me turn around."

She squirmed under him and cock eased out of her pussy with a loud plop. Then she scooted around, kneeling on the bed, her ass in the air for him. His cock, already lubricated with the juices of her cunt eased towards her tight puckered anus. He rested it at the entrance of her back passage and then gently eased himself in her. The tension was almot audible, neither spoke until Billy had busried all nine inches of his staff into her tight rectum.

"Oh, Mum, you've got so tight. My cock can hardly move"

Selina could barely remember this sensation of having her ass filled by meat. It wasn't comfortable. and yet it was wild. She adjusted to the sensation and then moved back on him - trying to impale herslef even furthur on his cock.

"You're fucking my arse, Billy. It's a bit sore, so please take it easy" she grunted

Very slowly he started to pull out and plunge in, fucking her ass slowly. But the excitement of doing this forbiddent things was too much for him. Within only three strokes he found himself read to explode in her.

"Oh, Mum" he moaned "I'm going to cum in your ass"

Another two strokes was all that it took - the tightness was too much for him - and he grunted and half yelled as his spunk again shot out deep into her bowels. Gob after gob of spunk deposited deep into her.

When his cock started to soften it fell out of its hidey hole. Selina turned round and looked at him.

"That felt good, baby, better than I thought it would."

Just then there was a clapping sound from the door. Selina and Billy looked across, and there was Jim and Triana clapping their hands, applauding the efforts of both Billy and Selina

"God, that was hot" breathed Triana, "have you got any spunk left, Billy, Dad has run out of it."

Jim laughed. "She drained me dry, Selina."

The four of them laughed - all of them naked. Somehow Selina knew that there wouldn't be much in the way of sleeping tonight.