They double penetrate her

Emi's eyes went wide as she heard her youngest son's suggestion, but she was still pinned to the desk as Akira continued to use her mouth. She thought about protesting, but she already knew that nothing she could say would stop him. She was fully and completely his. Besides, she was in no position to stop him even if she wanted to.

Akira pulled his cock out of her mouth and as he did, she felt Ichiro pulled her up from the desk. She felt him slip out of her, but as she gained her bearings, she felt him pulling her onto the floor. She didn't resist as she positioned her to be on top of him, her legs on either side of his hips, and she looked deeply at her son. Their eyes connected and she felt his intense desire just before she felt him enter her from underneath.

She moaned with the pleasure of him entering her again, but a moment later, she felt Akira's gentle pressure on her back as he pushed her down flat onto her youngest son. As soon as she was flat, she felt him throw her skirt up onto her back. A moment later, he lowered onto her and she felt and intense pleasure as her oldest son's cock stroked the sensitive edges of her anal opening. He was slick from having been inside her mouth, and the lubrication kept the feeling of his cock pushing into her special hole from hurting. She was expecting it to hurt worse than anything before, since she'd never had a man in her ass before, but instead, she felt nerves she’d never felt before awakened inside of her as Akira pushed himself deeper.

Both of her holes felt tight as her sons were inside her. It was the tightest pressure she'd ever felt, like her holes had shrunk, clenching down on the thick cocks inside her. Feeling her youngest son touching her g-spot and her oldest son touching nerves in her ass that she'd never felt before, she was already feeling most intense orgasm she'd ever experienced building. They were taking her to levels of desire that she'd never felt before.

Sandwiched between her two sons, she was completely at their whim. Aware that she was completely there's, both of her sons began moving their hips, pulsing their cocks in and out of her. It took a moment for them to get the rhythm, but soon she felt her sons working with each other, with Ichiro barely moving so that he didn't slip out, but pulsing opposite of his older brother.

Emi felt herself slip into a deep, continuous, slow orgasm that didn't seem to stop. She felt completely stuffed by her sons, and that feeling dropped her into a headspace she'd never thought possible. Hearing Ichiro's moans in her right ear helped push her into that mind space, and the pressure of Akira pinning her down onto his younger brother let her slip into the deep depth of her mind. Meanwhile, she felt both of them touching every pleasurable spot within her, causing her body to shiver as she experienced a never-ending feeling of pleasure. Her whole body shivered and rocked with their thrusts and she knew that she would never be able to forget what it felt like to be so completely filled.

It seemed that her sons felt the same pleasure too, because before long, she felt them pushing as fast as possible into her. They were both moaning wildly, and a moment later, she felt them both stop as the spurts of hot cum began filling her. Simultaneously, she felt the heat course up into her guts as Akira shot his loads deep inside her, while she could feel the warmth of his cum coating the inside of her pussy.

Akira collapsed on top of her, and she felt the weight of him transfer into Ichiro. The three of them laid there for there for a long moment, letting their breathing calm and their hearts return to a resting beat. After what seemed like forever, Akira pulled away from her, letting his his cock fall out of her. Once he was off, she climbed off her youngest son and stood on shaky, weak legs as he sat up from the floor.

However, as she leaned against the desk for balance, her mind cleared. She turned to look at the book, the one that had whispered secrets to her, she found that it was still open to the title page, but the inscription and the symbol were gone. There was no writing in the cover and instead, she found herself looking at a regular, first edition copy of “Nami-ko” by Rouka Tokutomi.

“Mother?” Akira said, his voice confused.

"What did we just do?" Ichiro asked from the floor.

Turning to her sons, she looked at their faces. She had no explanation for them, and she could not hear their thoughts anymore. However, she could not deny what she had felt and how much about their inner desires that she had known. And she couldn’t deny that she had felt something for both of them for a long time. And the feeling of their cum dripping down her legs filled her with an inner contentment she'd never felt before.

As she encouraged them to get dressed, she knew that when they left the library and returned to the world, there would always be something different between the three of them. And as she moved toward the door, she felt the tickling feeling as their cum ran down her legs.