The whole scene looked very much like what I had scene the day before. Kim rolled over on her back. Her eyes were closed. "You're so good you might as well do my front too." The fifteen year old blushed again but said nothing only gazing at her sister's exquisite breasts displayed before her. "Come on." Kim told her insistently her eyes never opening. Cathy began by rubbing some lotion on Kim's shins and upper legs. She the moved gingerly up to cover her tummy. She seemed to spent an undue amount of time there realizing next she would have to touch her sisters luscious tits. Kim her eyes still closed told her insistently to "Do my boobs." Cathy softly rubbed Kim's left breast than her right. "Ooh that feels good." Kim softly whimpered. Cathy seemed to be getting into it and paid special attention to Kim's nipples which were now standing to attention.

Her eyes still closed Kim shifted and slipped her bikini bottom off. Cathy gasped, "You don't have any hair." Kim opened her eyes and told her that that was a special trick she had learned and would show her later but taking Cathy's hand drew it down to her pussy. She directed Cathy's hand to stroking her. Kim immediately began to moan and squirm around under the pleasuring she was getting. Cathy seemed to know what she was doing and in a matter of minutes my wife began to come under the skilful fingers of her sister. I am sure Kim came several times than finally pushed Cathy's hand aside.

Cathy sat there in stunned silence. Kim finally opened her eyes. With a twinkle in her eyes she said to Cathy, "You were very naughty to do that to me, weren't you?" Cathy seemed bewildered and blubbered something like, "But you told me to." "But I didn't expect you to go that FAR. I think you deserve a spanking for being so naughty. Up to my bedroom immediately." Cathy was onto the game now. Your readers will remember Cathy's kinky interest in being spanked and Kim's catering to her strange appetite in her letter.

I almost missed my cue to get into our walkin closet before they came into the bedroom. I was into the closet and had just closed the louvred doors when I heard them coming down the hallway to the bedroom though. The doors were opened a crack and I could plainly see my delicious wife and her sister the vixen. Kim was nude and Cathy still had her bright red one piece bathing suit on. I knew it wouldn't be long before she lost it. My cock was throbbing from having just watched Cathy finger her sister off and in anticipation of what was about to happen to her.

Kim told her to get out of her suit. Cathy slipped the shoulder straps off and wiggled her way out of the rest of her bathing suit. Cathy has lovely young firm breasts and a slim waist and gorgeous ass. Kim was sitting on the edge of the bed watching Cathy undress. "Get your ass over here." she ordered after Cathy had stepped out of her bathing suit. Cathy came over and stood before Kim. Kim told her to lie across her lap. I watched excitedly as Kim began to slap repeatedly Cathy tender young backside. In a few moments it began to redden. Kim was finding the exercise hard on her hand though and reached behind her and grabbed an 18 inch ruler she must have strategically left there.

After half a dozen whacks she paused. Each stroke had left a large red mark on Cathy's ass. Kim told her to get up. "You had better be good from now on," she lectured Cathy. "No more being naughty." she paused for effect, "Unless you are really, really GOOD." The gleam in her eye left no doubt what she meant by "GOOD". Cathy told her she would be good if she only knew what she had to do.

Kim directed Cathy to get down on her knees beside the bed. Kim placed her ass on the side of the bed and leaned back with her arms locked behind her supporting herself. She spread her knees wide apart. "You liked my bald pussy. Have a closer look." Cathy moved her face only inches from her sister's bad cunt. "If you want to be GOOD, eat me out." Cathy paused and Kim added, "Unless you would prefer another spanking." Cathy moved in closer and began to lap at Kim's outer cunt lips with her tongue. They were both sideways to me maybe six feet away and I had a pretty clear view of the action.

Kim mumbled something like how good it felt and told her to lick her inner cunt lips. She began to moan and after enjoying Cathy's tongue action murmured for her to stick her tongue up her pussy. Cathy tried as best she could but she didn't seem to be getting in deep enough to satisfy Kim. "Lick my clit" Kim whimpered as her passion rose. I watched fascinated as Cathy lapped at Kim's clit which I knew would be swollen with her mounting sexual lust. Cathy was having a tough time staying in contact with Kim's pussy because she was moaning and thrashing about as her climax built within her body. Throughout she was sighing, "Oh Yes. Oh Yes." obviously pleased with what Cathy was doing for her. Finally she came and came and came. Cathy didn't stop her tonguing until Kim pushed her away satiated for the moment.