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.
"Ohhhhhh...my...goooooooooddd!!" Susan moaned as her new stronger orgasm approached.
Paul was amazed at Erik's stamina. He fucked his wife hard and steady for twenty minutes without stopping as his wife continued to cum. Her pussy convulsed around Erik's young hard cock urging it to release its contents. Finally the sight of Susan squirming and writhing in orgasm before him, the feeling of her tight hot pussy squeezing, ringing out his swollen cock was way too much for Erik. He couldn't hold back any longer, even if he had wanted to.
"Oooohhh Mrs. Fisher!!" Erik shouted as his cock started erupting deep inside Susan's waiting pussy.
Susan felt his hot cum as it shot out deep inside her pussy. This set her off again and she cried out as she was overcome by her new climax.
"Aaahhhh... I'm going... to cum again," Susan screamed one last time in major orgasm.
Erik held firmly inside Susan's pussy as she started jerking all over and bucking under him. Obviously Susan loved the feeling of a young potent man cumming inside of her, filling her up with his hot sperm. Again her hubby could see sperm coming out of his hot wife's pussy past where Erik was plugging away with very short strokes. Then there was more, then there was a lot. Erik kept fucking his wife long after Paul could tell he had cum in her. Then Erik leaned down and kissed Susan deeply and Paul saw her arm snake around his neck pulling him hard to her. Paul looked on stunned and confused, but excited at the same time by the intimacy of their kiss. The one thing that eluded Paul was how to cope with the power and intensity of his lovely wife intimately and passionately French kissing her new young lovers. To witness it was an incredibly volcanic mix of beauty, passion and lust. Also thrown into the same mix however, was a sharp dose of fear, insecurity and confusion. But Paul did not object. He was aware his wife simply enjoyed it too much. It was so clear for everyone to see!
Finally Erik pulled his big cock out and collapsed spent on the bed next to her. Paul looked right into his wife's well fucked pussy. That was a lot of cum. A whole lot of cum! Paul had a feeling that his wife's thirsty womb was drinking up every drop of Erik's cum.
"Ohhhh ... my god Erik..." was all Susan could say in between gasps. She was totally exhausted and her body went limp but she glowed as only a well fucked woman can glow.
Greg lay down on other side of Susan, now she was lying on the bed between her two lovers. Their arms were around her shoulders in a sign of possession and ownership. Her legs remained parted and Susan could feel her lover's cum dripping from her pussy and slithering down over her asshole. She felt warm and alive in the afterglow of countless powerful orgasms her young lovers gave to her.
"Oh, I can not believe," Paul looked at his watch. It was 8:50 p.m. "My wife had spent more than two hours with Erik and Greg. That was more time than in her training."
"Yes, hubby, they fucked your wife for almost three hour straight," Dr. Clark confirmed with smile and added, "But your wife obviously enjoyed being with her young hung lovers. You could see that Erik's and Greg's cum was already partially changing your wife. Her body's senses were heightening and she'd be able to take them both many more times. Now, her body was adapting itself to mate with young studs frequently. And don't forget, this treatment is for her training, too. It is very important training to achieve your wife's best sporting result's."
Paul nodded and looked at his wife. She was still breathing heavily, making her heavy titties rise and fall, attracting the attention of her lovers. Each of them started softly massaging her heaving breasts and cuddling and kissing her.
"Are you okay, hottie?" Dr. Wood asked her softly.
Long minutes passed until Susan could speak again.
"Ohhh... yes ...that was...incredible," Susan finally managed to gasp. "Oh... Erik... thanks you," she said almost incoherently. Then she looked at Greg and said with a shy smile, "Thank you... Greg. You were great, too!" Finally she looked at her husband," What I really enjoyed was knowing that my husband was watching me while I was ... errr...being fucked by other men!" In the back of her mind she felt the slight tingle of pride that she was woman enough to satisfy two young potent men.
