[This series is continuous so it will be necessary to read the first installment to get into the story. There is some direct reference to bodily functions so those unhappy with that should read no further.]
*
Christine held her hand around Jim's hard cock for a time as she tested him to ensure he did not cum while only the head was still in Susie's vagina. Then she gave the order for him to withdraw and stand up, hard cock pointing up, apparently to be deprived of orgasm. Susie, too, looked round at her older dominating sister, disappointed to be left on all fours high and dry.
"You both should understand that my controlling when you can orgasm is an important part of your disciplinary regimen," Christine told her Susie and Jim, who as husband and wife had not been accustomed to delaying gratification of this kind previously. "Orgasm will now be a reward for your good behavior."
"However," she smiled, "I'm not a really cruel bitch, although you both probably want me to be on some occasions so you can use this experience to improve your overall lifestyle. So let's proceed tonight by my asking Jim to undress me for the next part of our program."
Susie, still on all fours on the bed, with her red bottom from being spanked by Christine, sticking out for the others to see, whined, "Oh, you mean I don't get to have him in me so I can cum, Chris?"
Seeing the stern look on her older sister's face, Susie realized her mistake and added, "Oh, I'm sorry, Miss Christine, I won't forget that again, oh, please don't spank me again for that!"
Chris smiled as Jim carefully unbuttoned her crisp white blouse, removed it and unzipped her classic grey flannel skirt. She now was standing in her lovely white bra and matching garter belt and panties, along with her seamed stockings and pumps. She motioned to Jim to unhook her bra and then she smiled as he patted her ample 36C chest and felt her nipples stick out and become firm.
She took the next step of slipping down her panties and unhooking her garter belt, rolling down her stockings as she stepped out of her smart burgundy pumps. Now all three were in the all-together together and Chris lay down on the bed next to her sister, still on all fours.
Jim stared at Christine's plentiful sandy blonde pubes and wondered what might be in store for him in particular. His fantasies of fucking this lovely woman were rapidly escalating.
"Jim," Christine said in a severe tone, "get over here on your knees and start showing me some oral appreciation."
As she readied for her own intercourse, she issued a crushing order to her expectant younger sister to pull up her shameful little girl panties.
Seeing Susan begin to mope, Christine snapped, "Susie, you will not whine or carry on or you will get another spanking, and be wearing those panties all the time but you will not be having any sex at all."
Now Jim responded to his domme's instructions and began lapping at Chris's already wet but tight slit. He leaned his face into the warm orifice and enjoyed the powerful flavor, both taste and smell, that exuded from Christine's hairy pleasure center. Chris was getting very very wet and had to resist moving her hips in rhythm with his tongue's swipes at her pussy.
Soon she could hold back no longer and came quite strongly, moving her lower body and giving Jim a nice squirt of her warm pussy juice in his face. While this was going on, Susie looked disconsolate at her husband's having brought her older sister to the orgasm Susie had been denied.
Christine came down from her cum to force herself to rise to her feet and extract her thin cane from her handbag. Both Susie and Jim blanched as they saw her brandish the clearly painful implement and give it a fear-inducing swish through the air.
"Susan," Chris intoned, "I hope I do not need to keep giving you a refresher course on behavior, but you clearly need one." She lay the cane across Susie's already red bottom, drew it back, and with two quick flicks of her wrist, applied two penetrating strokes across the middle of her sister's cute bottom.
Susie screeched from the pain which only deepened as the cane strokes sunk in, and the tell-tale tram marks appeared on her bottom.
"Oh, oh," Susie cried, "oh, Miss Christine, I won't sulk and I'll be good, I will, I will!"
"That's what I like to hear, sweetie," Chris said warmly, "but you need two more to make sure you remember." With that, she lined the cane up at the base of Susie's bottom and with two more flicks of her wrist, aimed two strokes at the very sensitive area between Susie's bottom and thighs.
Susie couldn't help but let out a real cry of pain this time and Christine whispered in her ear, "There, there, sweetie. That's over."
Christine now lay back down next to Susie, who still was required to remain on all fours on the bed and told not to rub her aching bottom cheeks. Christine spread her attractive legs and with her finger, beckoned her brother-in-law to her love tunnel by calmly pulling him by the penis in between her legs.
Jim was delighted to get the chance to fuck his sister-in-law so soon and somehow resisted the urge to plunge his tool into her waiting cunt. He penetrated her orifice slowly and felt pleased when he heard her murmurs of pleasure at his approach. He also realized he had better use his arms to hold his weight off her lithe body so that the only pressure Chris felt was the pistoning of his firm prong in and out of her wet hole.
Jim did lean down to lick and kiss Chris's now very firmly risen nipples and also take the advantage of kissing her there and on her warm lips, welcoming her opening those to welcome his tongue as it met hers.
It did not take too long for her to reach a delightful orgasm and she also indicated to Jim when he was now permitted to cum inside her so as to increase her own enjoyment by simultaneously climaxing.
Chris did not intend to leave Susie without any satisfaction when both Jim and Chris had achieved quite massive orgasmic pleasure. She reached over as she was coming down from her own cum and began teasing Susie's cute little love button with her fingers. She assumed Susie shared her own huge clitoral sensitivity and her estimation was confirmed as her younger sister immediately began to flow copiously and buck her hips in response to Chris's clever teasing.