Kate and Frank realized that to reach their goals with Andy, they would need to work together and pay close attention to how he responded to their efforts. They knew he would react differently to each of them with Frank being a man and Kate a woman of course, but then there was also Frank’s role as a physician, and of course, Kate being Andy’s aunt. The ultimate goal was for Frank to take Andy anally. Kate and Frank had both discussed this. The had pretty much realized they wanted to do this by the end of the day he arrived. They both found him adorably handsome and with a such an attractive slender fit physique that they found themselves trying not to stare. And they loved the appearance of his bottom — the smallness, the taught lines, the perfect round curvature to his buttocks, the perfect straight narrow tight crevice where his buttocks came together, and the shallow depressions where his gluteal muscles began and ended, both on the outside faces of his cheeks and on his lower back just above their starting point. Frank had quipped that if Leonardo Da Vinci needed a model for an anatomical drawing of this part of the body, Andy’s little ass would be perfect.

Then there was Andy’s innocence and curiosity that they both found endearing. Teaching him about the secrets of his own body was highly erotic to both Kate and Frank. They both loved the subtle look of shock and embarrassment his face would should each time they announced the next part of his anal journey.

Kate wanted so badly to be there to witness Frank taking Andy’s bottom too. She had discovered gradually that she found watching Frank penetrate others anally incredibly hot to watch. She first got a sense of this when she would assist him with medical exams. Seeing his tall muscular frame over a young woman or a young man, and driving his thick index finger deeply into their rectums really aroused her. She remembered the first time she watched him do this, her panties were wet with arousal the rest of the morning until she could go back to the house at the end of the morning’s work and change them. She skipped lunch that day, using her midday break instead to masturbate furiously in her bedroom. Seeing Frank dominate a younger man in this way absolutely thrilled her. That it would be her darling nephew made it even more exquisite to her. As she thought about Andy getting it up his bottom the first time, she remembered how she lost her anal virginity to Frank. The intensity of the physical sensations, the submissiveness, the delicious naughty thrill it gave her. She wanted to be there when Andy experienced all of these things for the first time.

Frank summarized what he perceived as their progress so far, “Physically, I think he is moving right along. He is quickly adapting to larger diameter penetrations, he exhibits much better neuromuscular control of his anus and rectum. He has also become more accustom to the physical sensations. He is on a path to begin to interpret the different sensations in his anus and rectum as not solely connected to bowel function, but to their sexual and erotic components as well. The last time I had my finger in him, I could clearly see some penile swelling and I believe I glimpsed a clear drop of pre ejaculate at his urethral meatus. I took note of exactly what I was doing when this occurred. I had my finger curled toward the front of his rectum, not so much against his prostate, but more pressing and hooking behind his internal anal sphincter. That seemed to be the technique that arousedd him. That’s worth trying again.”

Kate agreed with all of this, but was still concerned, “The psychological hurtles are considerable. The goal is not just for him to give himself to you, but to submit to this as his Aunt watches. That’s why I’ve been trying to be there interacting with him when you have worked on him so far. If he finds he needs me there to soothe him and coach him, that may help. And remember. You promised me from the beginning that i would be there. If you try to do it when I’m not there, I’ll sabotage the whole thing. We have a deal. There is some risk to this for me. It could harm my cherished relationship with him. What if he freaked out and told my sister?”

“Kate, I want you there too. I know this is a team effort. It will make it more special for me to have you watching. I’ve been thinking about how we do this. How can we introduce the proposition in a non threatening way? I think your experience with anal would be valuable to share with him.”

Kate’s eyes widened in surprise and annoyance, “Are you nuts Frank? You expect me to talk to him about that?”

Frank remained calm and didn’t miss a beat, “Actually Kate, I was thinking more of Andy watching the two of us. If he…..”

Kate screamed before Frank could finish, “Are you fucking out of your fucking mind? No fucking way!!!. You are an ASSHOLE Frank! What could make you possibly think that’s okay?!?”

Frank just calmly watched Kate as her face contorted in rage as she went on, “No No No! No fucking way!!!” She got up and walked over to the window and gazed out breathing quickly and audibly. As she calmed down, she was horrified to feel distinctly the unmistakable sensations of physical arousal — a slight tingling and swelling of her vulva and the sensation that the cotton fabric of her panties was no longer freely sliding over her labia when she moved, but rather stuck to her as her secretions glued it to the bare skin of her shaved outer labia. As much as she wanted to suppress her reaction and what it meant, she realized of course that she couldn’t. She was somewhat of an exhibitionist. That she knew. But in front of her nephew? How could she justify it?

Frank seemed to know exactly her state and her thoughts at that moment, “Kate, you would be providing a loving gift for him. It’s a perfectly appropriate thing to do. It’s so much better for him to first experience these things safely with two caring and knowledgeable partners.”

It proved easier to convince Kate than Frank had expected. She turned to face him and let out a deep breath. “You have to promise that we proceed with extreme caution and abandon the plan if we it seems like he is starting to react unfavorably. Even if he is going along with it, you and I need to be willing to call it off if it seems it is going to happen in a way that will harm him physically or emotionally. Can you promise me that?”

“Kate, you have my word.” He kissed her forehead and embraced her as he went on, “I’ve become very fond of Andy myself and would never want to harm him. On top of that, I know how much you love and cherish him. These things will guide me.”

After these solemn words were spoken, their close embrace rekindled the lust they felt as they contemplated their plans. Kate’s head was nestled under Frank’s chin as he whispered to her, “Kate can you feel how hard my cock is against you? The idea of gently and lovingly fucking your beautiful ass as Andy watches is going to be with me every minute of these days ahead.” Kate felt Frank’s large hands slid down over her bottom and firmly grip her buttocks and then pull them wide apart, conveying the intensity of his lust to her.