Mom teaches son 3

After Cathy and Bill had had sex with Gigi, Cathy drove Gigi home. When they arrived at the house Cathy went in with Gigi to meet her dad.
He met them at the door and Gigi introduced Cathy,
“Dad, this is Cathy, Bill’s mom. She gave me a ride home after Bill and I went to his house to meet her.”
“Hi, Cathy, my name is Frank, pleased to meet you. Gigi is very fond of your son. I didn’t know he had such an attractive mother.”
Cathy accepted the compliment.
“Thank you Frank. Gigi tells me that you’re a single parent also. I’ve been divorced for a couple of years now.”
Frank’s eyes lit up with that.
It was getting late but before Cathy left, Frank invited her and Bill for dinner the next evening.
Cathy returned home and told Bill about the invitation.
“I wonder if Frank has any designs on his daughter?” Cathy wondered.
“We’ll, obviously, I wouldn’t blame him if he did. But do you think he would actually follow through on his desires?”
“Maybe if we encourage him. I get wet just thinking about a foursome with them.”
Bill smiled and said, “I can take care of that for you!”
“Mmmmmmm, I know you can! So what are you waiting for?”
They stayed on the couch and Bill and Cathy, extremely horny at the prospect of a four way with Gigi and her dad, just pulled their pants off. Bill laid on his back and Cathy mounted him, impaling he cunt on his long, fat, hard cock.
“Ohhhhhh god Bill! Just think! Fucking me while Frank fucks his daughter and then switching partners! Oh fuck! Just the thought makes me so fucking hot!”
“Oh yeah mom! I can’t wait! That will be so fucking hot!”
Cathy was overcome with lust as she jammed her cunt down hard on Bill’s cock over and over. She was hurting her poor cunt with the violent fucking but that only added to the pleasure!
“Ohgod Bill! Bite my nipples! Ohhhhhhhhhhhhh fuck! I’m gonna faint from all this! Ohhhhhhhhhhhhh fuck! Fuck! Ahhhhhhhhhh fuck!”
Bill pulled her down and clamped his teeth on her nipple and bit hard. He almost broke the skin but stopped just short of that.
Cathy started fucking so rapidly that her hips were a blur!
“Ohhhhhh fuck! I’m cumming! Ohhhhhhhhhhhhh goddamnit! Fuck! Fuck! Fuuuuuuuuck!”
She started trembling all over and Bill had to hold her hips to keep his cock buried.
Then he stiffened and started to shoot long ropes of cum into her cunt!
“Ohhhhhh holy fuck! Ohhhhhhhhhhhhh god mom! I’m cumming! Oh holy fucking god! Ohhhhhhhhhhhhh yes!”
They both collapsed in exhaustion after the extreme orgasms faded to a pleasant tingle.
“Damn Bill, I almost fainted on that one! If we can get Frank to fuck Gigi I may have a heart attack!”
“Yeah, me too! I’ve never cum like that.”
The next evening Cathy and Bill arrived at Frank and Gigi’s house.
They had pizza delivered and the adults allowed the teens to have a glass of wine. They got along really well and as the evening progressed and the wine bottle emptied, replaced by another, the conversation turned to more personal subjects.
“You know, Frank, Bill and I are very close. We do everything together.”
Cathy said with a direct look at Frank.
Frank thought he caught the meaning behind the look but wasn’t sure if he was right. He wanted to probe a bit. Not that he would be disgusted if they were that close. On the contrary, he wanted to get into Cathy’s panties and the thought that she was fucking her son really turned him on. He had to admit that since Gigi had developed into a sexy young teen he had some definitely not dad like thoughts.
“Everything?” He asked with a raised eyebrow.
“Yes Frank, everything. Does that shock you?”
“No, but it does make me excited.”
Cathy looked at the bulge in his pants and said, “I can see that!”
Gigi looked at her dad surprised. She never thought about him that way but now that they were talking about sex, she found that she was getting excited about her dad fucking her!
Cathy asked “would you like to see Bill and I fucking?”
Frank looked at his daughter then said, “yes I would, very much so!”
Bill and Cathy were on the couch and Frank and Gigi sat on a loveseat.
Cathy pulled Bill into her arms and kissed him passionately. Frank was really turned on by the two kissing like that. He had thought about what it would feel like doing that with his daughter.
Bill pulled Cathy’s tee over her head and exposed her braless tits.
Gigi looked down at her dad’s crotch and saw the bulge. She was shaking as she put her hand on it.
Frank jumped when he felt her hand. He looked over at her and saw the desire in her eyes.
“Oh god honey!” He said as he pulled her to him and kissed her, probing her mouth with his tongue.
They stopped kissing momentarily to watch Bill remove the last of Cathy’s clothes.
Frank had his hands on Gigi’s tits as they watched Cathy frantically pulling Bill’s clothes off.
Then Cathy straddled Bill’s lap and took his cock and put it in her cunt.
“Ohhhhhh yes Bill! Fuck mommy!”
Frank had to have his daughter now! He pulled her tee over her head and sucked a nipple into his mouth.
“Oh daddy! That feels so good!”
While he was sucking her, he pulled her shorts and panties off. Then he pulled his pants down and lifted her over his erect cock.
He lowered her and she guided his cock into her pussy.
Cathy watched them over her shoulder and smiled at Frank. She really liked him and his daughter.
“Ohhhhhhhhhhh daddy! Oh gosh daddy! You’re so big!”
“I’m not hurting you, am I baby?”
“Oh god no, Daddy! It feels really good! Don’t stop!”
Frank was lifting her up and down on his cock. She was incredibly tight and he could only get part of his long cock into her. Every time he lowered her, his cock would go deeper as her cunt stretched.
Cathy watched his big cock and couldn’t wait to get it inside of her. It made her even hotter and she was going faster on top of Bill.
“Ohhhhhh god mom! Fuck me! Ohhhhhhhhhhhhh yes! I love your cunt!”
The sounds of fucking filled the room. Wet squishy sounds and moans from all of them. The lewdness of the incestuous acts drove them to new heights of ecstasy.
That level of passion can only last so long and in minutes all four of them started to orgasm at the same time.
The men’s orgasms hit so suddenly that they couldn’t pull out in time and deposited their sperm into two very fertile cunts!
They all relaxed after their intense fucking. Instead of getting dressed, they removed the remaining clothes and sat naked.
Cathy said, “I don’t want to get pregnant and I assume you don’t either, Gigi. I’ll get us both morning after pills in the morning.”
“Oh yes! Definitely do that!”
Frank said, “why don’t you and I trade seats Bill?”
They traded and Frank began kissing Cathy.
Gigi told Bill, “I’m so happy that dad and Cathy like each other.”
“Me too, I really like Frank!”
Despite having just finished fucking, Franks cock started to rise again while kissing Cathy. Cathy slid down and took him in her mouth, sucking noisily and taking him into her throat.
“Damn, Cathy! You sure know how to suck cock!”
“I can certainly agree with that!” Bill told him.
Gigi knelt on the floor in front of Bill and started sucking his cock. Again the room was filled with the sounds of sex, this time slurping sounds.
Bill and Frank both had very hard cocks and the talented girls drove them to cum quickly. Just before that happened, Cathy told Gigi to hold the cum in her mouth and wait for her to come over.
When the guys finished cumming, Cathy crawled over to Gigi and took her face in her hands and kissed her, swapping cum until they both swallowed the mixture of Bill and Frank’s cum.
After that evening the two families got together often. After a few months, Bill and Cathy sold their house and moved in with Frank and Gigi.
They lived as a family and after college, Bill and Gigi married. They still lived in the house with Frank and Cathy.
The two couples had 5 children, not sure who the father was in each case