"With only the two of them left in the room, Grandma Vivian turned her head towards Orion and asked, "So, what brings you here? Is there anything I can help you with?" Her voice was filled with curiosity.

Orion gave a small smile and shook his head, "I'm just here because I was feeling bored. But if you have any tasks to do, I wouldn't mind lending a hand." He responded, cupping the other rear end of her bountiful cheeks. Surprisingly, he was beginning to miss the concept of panties and undergarments as that would have made his invasion of Grandma Vivian's bare buttocks a little more exciting and thrilling.

Grandma Vivian nodded thoughtfully in response, "Well, since I don't follow the others to work, and Celia had decided to stay with me at home, I don't really have much to do except rest and wait until they came back".

Orion couldn't help but shake his head internally at the fact that what she had just said would be interpreted as 'I am going to keep myself company with nothing until evening' A sigh escaped his lips as he began to also miss his entertainment.

Nevertheless, since they were both going to be idle for the rest of the day, there was no reason for him not to go straight ahead and focus on his main reason for being here.

He freed her ass from his grasp and asked, "Can you bend down a little, Grandma Vivian, I want to check something?".

Grandma Vivian looked at the boy curiously and wondered what he was up to. Still, since he wasn't asking for much, she bent down a little and rested her hand on her knee, using it as her support.

As she watched Orion from the corner of her eye disappear behind her, her curiosity was piqued and she asked, "What do you want to do?"

Meanwhile, Orion couldn't help but nod his head as he looked out at something. "I just wanted to see how large your buttock is and compare it to Grandma Celia's," he responded, feeling his throbbing penis finally stand straight, pressing against his tulga.

Grandma Vivian was astounded by what she had just heard. Without hesitation, she straightened her back and turned around to look at Orion with a frown on her face and an intense gaze in her eyes.

Witnessing her action and expression, Orion quickly added "Grandma Celia allowed me to play with her body yesterday, and she had much larger buttocks than your own, so I just wanted to ask to confirm if it were true".

Since the world's sexual knowledge was so non-existent to the extent that his mother can stroke his penis during their bath, Orion wanted to find out how much he could get away with his words. He knew that there was a limit somewhere, however since he was the only one around, to know about this, what other way could he find out about the limits without testing the waters himself?

'So this was his reason,' Grandma Vivian sighed in relief. From Orion's words, it was obvious that he wasn't attracted to Celia's body and simply wanted to find out if hers were smaller than Celia's. Of course, his reasons were understandable since she was well aware of how unattractive her body was. Even though she had a wide, fleshy buttock that was smaller than Celia's, it was still large enough to be considered unattractive. She quickly responded, "Yes, your Grandma Celia's buttocks are way bigger than mine." She then proceeded to chuckle at the thought of her friend walking in on them and hearing their discussion. "But don't tell her that, okay? She still believes that hers is much smaller than mine."

Orion dazedly nodded his head at the sudden change in the atmosphere of the conversation. He had thought that he was already waist-deep in understanding how this world works, but in reality, it seemed that he was still at the shore with only one foot in the water.

'Time to get down to business,' Orion thought mischievously as he stared at the amused gilf in front of him and said, "Can you bend down so that I can check it out?"

This time around, Grandma Vivian didn't only bend down, but raised her gown and anchored it on top of her buttocks. She then spread her legs a little and said "Go ahead".

Orion didn't need to be anything more than that before he positioned himself once more behind her and began to sample her firm behind. He raised his hand and gently slapped them with enough force to make her buttocks vibrate so that he can test its juggling momentum.

He nodded in appreciation at the sight of two protruding cheeks rippling with an enticing force. "This is good" Orion muttered to himself as he pulled down his tulga and stood bare naked in the middle of the room.

Grandma Vivian felt Orion's hand running against her enormous buttocks and couldn't help but furrow her eyebrows once more. Although she could tell that he wanted to not only make his test, but also play with her body the same way he had played with Celia's, she didn't refuse as there was no reason not to let him do so.

Nevertheless, since the first time she had met Orion, he had always been a shy young man. She couldn't help but wonder if he was trying to use her to practice for the upcoming awakening ceremony, as he was old enough to participate in this year's own. However, she was unsure if her assumption was right or wrong.

"Grandma Vivian?" Orion called out for the aged woman's attention, dragging her out of her thoughts.

Immediately Grandma Vivian wanted to respond, but she felt something inserting itself into her vagina, causing her to moan out abruptly "Uhh~~ Ah~~ uH~~"

Seeing her moan out loud every time he stuck his three fingers at once in her and removed it, Orion continued keeping his thrusting and withdrawing technique at the same rhythm with a grin on his face.