Many thanks to Robbie for editing and improving this.
*****
Greg obediently pulled out his cock and Erik quickly took his place. He pressed his cock head against Susan's pussy lips gently forcing his way inside of her. After being stretched by Greg's fat cock, Erik penetrated her easily. Susan enjoyed the new sensation of being filled with some thinner but longer cock. She began to wriggle her hips, then lift her legs wrapping them around Erik's waist like she didn't want to ever let him go. This allowed nice body contact and also this let Erik sink even deeper. Paul heard his wife moan with pleasure as Erik fucked her with full force. Susan groaned loudly as she twisted her hips with the head of Erik's cock touching her sensitive cervix. Apparently, the higher Susan wrapped her legs around Erik, the deeper Erik could penetrate her. She continued to pull her hips back as he pushed into her, pressing into her cervix again.
"Ooohhh," Erik groaned as he plunged all the way into Susan. With Susan's legs wrapped around his upper back, his cock started to enter another fleshy ring - her cervix!
"This positions allow for deeper penetration than others and enable your wife to enjoy her lover's cock penetrating her cervix. But this positions can be pleasant for her lover too," Dr. Wood explained Erik's sudden groan. She was aware that the tip of Erik's cock was pressing hard against the mouth of Susan's womb.
"Ohhh... yes... Erik, fuck meee... pleeeease," Susan was gasping.
She couldn't do anything but whimper, grunt and moan as Erik fucked her. She began to orgasm again, her uterus convulsing as Erik continued to slide his cock head through her cervix and into her uterus. Erik fucked her this way for ten minutes, then he and Greg changed places again. Paul realized these young studs really enjoyed sharing his hot wife equally and his wife definitely wasn't complaining.
"Paul, your wife has the most fuckable pussy I've seen in a long while. Her puffy peach is oversized and beautiful. Her meaty pussy is quite inviting," Greg noted.
Greg started to slap Susan's pussy again, spreading her swollen pussy open to its limits, forcing his captive's sensitive clitoris out of its hood so it was fully exposed, This time he did it harder, making her grunt and jerk with every blow. Her heavy breasts bounced with each of Greg thrusts flopping back and forth, side-to-side.
"Ahhh... Greg... it's sooo damn good!" Susan cried out when Greg's fat cock caused a different sensation in her hot swollen pussy.
"Yeeesss Mrs. Fisher, you're so good, you're still so fucking tight," Greg said keenly.
"It is exciting to watch Mrs. Fisher's expressions change as Greg hit the right spot, a spot you hadn't ever touched," Dr. Clark noticed while looking at Paul.
Paul just nodded. His wife's sensitive inner lips and her clit felt swollen and pulsing hot, stinging harshly with every blow. It was too sensitive, stimulating her mercilessly. As Greg stepped up the pace, her eyes rolled back in her head, little shudders going through her body as he forced her higher and higher until her dam broke. She screamed throatily, jerking, flailing against the ropes as her orgasm ripped through her, her pussy spasming and clenching around the thick cock. Greg slapped her all the way through it, forcing her orgasm to draw it out, shudder after shudder going through her.
"Ohhh... ahhh... I'm...cummiiiinnnggg... agaaain!" Susan screamed as she again reached her highest level of excitement. She came so hard that her stomach hurt, her clit throbbing in time to her pulse as her pussy contracting around Greg's cock.
But it was just the start of her fucking, not the end. For the next two hours, Erik and Greg took turns fucking and pleasuring Susan in her favorite position - doggy style position. She had obviously adjusted to Erik's and Greg's cock size's because she started moving her hips to match their rhythm. One orgasm after an other ripped through her body as two young studs fucked her alternately with long slow strokes.
"I'm going to cum, Mrs. Fisher," Greg finally said as he started to pump his cock into Susan at a furious pace.
"Ahhh... yes, Greg, yeees... that's it. Cum in me... pleeeaaase," Susan said in an orgasmically strained voice, grunting, groaning and moaning
"Ohhh Mrs. Fisher, I'm cumming in you, I'm cumming in you!" Greg cried out, and let out a long loud satisfied moan.
For the first time Susan felt wave after wave of Greg's hot potent seed filling her vagina with each pulsation of his cock. She also felt herself milking Greg's thick cock with her vaginal muscles, pulling the cum up from Greg's balls further into her body. Her body was shaking and she couldn't breathe. Paul could clearly see his wife was having another powerful orgasm. It lingered for her and almost a minute went by while the room was filled Susan's cries of sexual abandon while Greg continued to fuck her hard. Paul stared in disbelief as Greg's sperm started to slowly seep out of his wife's well fucked and abused pussy. He couldn't believe how big Greg's load was and how eager his wife was to gobble every trace of his offering. Finally Greg pulled out his fat cock and got off the bed. Susan stayed on her knees with her gaping fuck hole glaring right at her hubby. Cum bubbled out, running down both thighs.
"Mr. Fisher, your wife's a great fuck!" Greg said as he collapsed onto an armchair, gasping.
Paul stood silent watching Erik, who immediately started moving toward his wife.
"Are you ready for some thick fiery sperm, Mrs. Fisher? I want to fill you up, Mrs. Fisher!" Erik asked, agog.
"Yes, please, Erik, I want your sperm too," Susan pleaded hoarsely, obviously losing all sense of inhibition in front of her husband. She was still excited, spread open on her knees, Greg's cum tricking from her freshly fucked pussy, her engorged clit and labia were clearly visible for everyone to see, along with her very erect nipples. Paul could not believe Susan's sex drive. How could she possibly be still horny after so much sex and orgasms?
"Lie on the back and spread your legs for me, Mrs. Fisher," Erik ordered and Susan did, obediently
Erik opened her legs more widely before penetrating her quickly forcing about half his length into her. He licked and sucked on her nipples for a while, making her moan shamelessly. He then started fucking her but he wasn't fully up her.
"How do you feel, Mrs. Fisher?" Erik asked teasingly.
"Please, Erik, give me all of your big cock, I need it," Susan begged.
Erik looked down at her as he continued to slowly pound her pussy, "Oh yeah, Mrs. Fisher, I know what you need, I would do anything for you because fucking you has been so good!"
Then he put his arms under Susan's long legs and pulled her knees back to her large breast. With her knees against her chest Susan held on for a long ride. Erik began fucking her harder and faster until he was literally bouncing on top of her. Susan was screaming as Erik thrust deep. She could feel her pussy starting to quiver.