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Sunday morning Sandy and Nina made pancakes and sausage for breakfast and all three greedily wolfed down several servings of both, the exertions of Friday night and all day Saturday having depleted their resources. "So, what are the plans for today?" Thad asked.
"We're going to introduce Sandy to back door action, carefully," Nina replied.
"I'm still nervous about this, guys, but I know I can trust you. But I think I need a safe word just in case," Sandy said.
"Sure," Nina answered grinning, "supercalifragilisticexpialadocious."
"Oh right, like I'll be able to say that with you shoving a vibrator up my ass!" Sandy deadpanned, then laughed.
"First off, you'll be fine. And second, no safe word needed, if you want us to stop or slow down just say so," Thad added.
"Sandy, speaking from experience, I think the best position is for you to kneel in front of that armchair and rest your upper body on the seat. That puts your butt in a good place to take the vib straight in. Kind of like how hanging your head off the side of the bed facilitates giving deep throat," Nina said.
"Ok. But since you just brought it up, I've never managed deep throat - my gag reflex kicks in. Maybe we can work on that sometime as well," Sandy told them as she assumed the position.
Thad got behind Sandy and rimmed her, while Nina caressed her cheek and encouraged her to 'relax'. When Thad first tried to push his tongue into her ass she tensed up, and he pulled back and said, "It's critical you don't tense up, Sandy. That will just cause pain. Focus on consciously relaxing your sphincter muscle."
Thad went back to rimming and this time when he pushed his tongue in it opened her hole slightly. Thad stopped and picked up the desensitizing lube, squirting a generous glob onto Sandy's asshole. "This stuff says to give it at least five minutes to work," he told the women.
While they waited Nina and Sandy made out and Thad fingered Sandy's pussy and clit. By the time the wait was over she was soaking wet, and turned on, which had been his intent. Nina passed Thad the smallest vibrator from the kit, hardly larger than his middle finger, but tapered to a dull point to ease entry.
"Ready?" Nina asked and Sandy nodded.
Thad put the point of the vibrator on the opening to Sandy's back door and let her get accustomed to the feeling. When she wiggled her butt, he began to push it in slowly. Sandy made no objections so he continued until all that remained outside was the base. Thad pulled it back out, but not all the way. Then he slowly began fucking her ass with the small toy.
"How are you doing, hon?" Nina asked. "So far so good!" Sandy responded.
"Thad, turn the vibrator on but keep it low to start," Nina instructed.
Thad complied and when the vibrator began buzzing he resumed stroking it in and out.
"Ooooooo!" Sandy moaned. "That feels great! I almost think I could cum this way!"
"I definitely cum when Thad fucks my ass with his cock. Never tried a vibrator but I could see it," Nina said. She caught Thad's eye and by raising her eyebrows several times silently communicated that he should increase the speed.
Thad turned the vibrator up to half speed which elicited another, longer and louder, moan from Sandy. In response, Thad also sped up the pace of the stroking he was doing with the toy.
"Oh jeeze, I know I'm going to cum. And nobody's even touching my pussy or clit! If I had known this I'd have learned to do anal years ago!" Sandy exclaimed.
Thad decided this merited full speed and turned the dial on the vibrator all the way. Continuing to rapidly fuck her ass with the toy he struggled to keep up with the bobbing and weaving Sandy was doing with her hips and ass. The lube had made the vibrator slippery and he worried he might lose control completely and push it fully inside her, but just then Sandy screamed out and came.
Thad held the vibrator still until Sandy cried, "Stop, please stop!" He quickly pulled it completely out of her as she collapsed with exhaustion. Thad gently rubbed her just violated back door to help her calm down. When his fingertip touched her pucker he felt it relax to let him enter, but he didn't. 'That's a very good sign,' he thought."
Sandy pushed her upper body up off the seat and, with help from Nina and Thad, slowly got to her feet. She immediately turned around and sat back down on the covered armchair. She chuckled as her ass felt moisture and she realized she must have been drooling earlier.
Grabbing Thad's arm she pulled him down to her and kissed him deeply, fully utilizing her tongue to dance with his. Breaking off she said, "Thank you, that was fantastic. I can't wait to do more!" Then she grabbed Nina and kissed her the same way, saying "I love you, sis. You are so good to share your husband with me."
Meanwhile, Thad had taken the vibrator into the kitchen and thoroughly washed it clean. Back in the living room he handed it to Sandy and said, "My turn." He hadn't planned that and was somewhat surprised as he said it but seeing Sandy cum from anal had him wondering.
"Sandy, can you stand now?" he asked her.
"Sure," she said standing up and freeing the chair for more use. Thad motioned to Nina to sit in the chair and then got on his knees between her legs. He kissed then licked her clit and slit then lifted his head to say, "Sandy, use the regular lube and medium vibrator, please, since I'm already used to having Nina's finger up there."
Sandy followed his instructions and then put the point of the vibrator against him. When he said 'go ahead' she slowly pushed it in all the way, then began stroking it in and out. Thad was clearly fully comfortable with this, so she turned the vibration feature on.
"Whoa!" Thad cried out, "That's different!"
Sandy reached around his hip and took his cock in her hand. It was as hard as she'd ever felt it and she wished she could take it into her mouth. While Nina was enjoying his oral attentions the angle really wasn't great for him to go to town. She tapped his head to stop him then leveraged herself up and over the arm of the chair.
"Back up, hon," she told him. Thad knee-walked backwards until only his shoulders and head remained on the chair. Nina put her head under his stomach and took his cock in her mouth. Sandy continued fucking his ass with the vibrator, and turned the speed up as well. When she cranked it to full speed he started moaning, and Nina felt his cock start to throb.
Nina used her hand to fondle his balls while her mouth worked aggressively on his cock. When she pulled up to the top and tongued his frenulum he exploded, filling her mouth with his cum and moaning. His instinct was to try to slam his cock all the way inside her mouth but she knew this, and had the advantage of position. She kept just the head inside until his orgasm ended, then crawled back up.
Thad reached back and managed to convey to Sandy that she should pull out. She did and he knelt back on his knees. Nina pressed her lips to his and pushed his cum load into his mouth before pulling back, leaving him full. Thad swallowed as this was something they'd not done in a while but had done before.
"Seems unfair," Nina said an hour later as they sprawled recovering..
"What does," Thad asked.
