Shirou Emiya wasn't as clueless as he made out to be.
He could feel Tohsaka gently pressing her palm onto his chest, slowly transferring her mana into him, and then there was nothing. His perception of the world muted, and he was consumed by the electrifying power that spread throughout him. Circuits he didn't even know he had began to sear underneath his flesh, drinking in all that they could take. His mind was in a haze as he floated within himself into a pool of energy; a blue ocean of things he could never truly explain.
Shirou never anticipated how intimate such a process would be until now, even though earlier a red faced Tohsaka had muttered the ceremony procedure as calmly as she could. Part of him felt as if he could meld with her at that moment, just be a part of her and never look back. She had so many qualities that he lacked. She was calculating, and cautious. She knew exactly what battles to fight, and when to walk away. She knew when to be selfish, and where to be completely selfless. He knew nothing of such things. He always strived to be selfless, and spur of the moment. He was calculating, but reason usually went out the window to be the hero.
His introspection was jolted, as a memory began to burn into his mind.
The sun was about to set, and a young man hadn't seemed to notice the potential darkness that was to come. He placed the bar swiftly in place, and began to back up to gain momentum. He ran as fast as he could, and prepared to make the high jump. He arched his back as much as possible, but it wasn't enough this time. As he landed on to the soft cushion, the bar had already fallen to the ground. The young man was on repeat, place the bar back into its spot, get a running start, arch the back and jump. Every time he seemed to fail, but he persevered.
The scene began to fully come into view, and a young Tohsaka had stopped in her tracks; entranced by the young man who wasn't giving up on the high jump despite his previous failures.
Shirou gasped for air, the guest bedroom coming into focus. He turned to see Tohsaka clinging to her pillow for dear life, a scarlet color painted on her face from some sort of embarrassment
"What did you see?" Tohsaka inquired, not making any eye contact with him.
What had he seen? He thought it could have been a dream, but it was a memory of Tohsaka? No. That wasn't right, it was a memory from Tohsaka. He slightly smirked, he had almost forgotten those days in Junior High. He had decided he would do high jump for that track season, despite what the Coaches had recommended. Was that the moment she became fascinated with someone like him?
"Shirou!" A pillow collided with his before he had a moment to react. Tohsaka was standing on the bed now with the weapon in hand, huffing in embarrassment. "Tell me!" she yelled, ready to strike again.
"Tohsaka, I-I'm not sure what I saw. It was so strange." He was going to keep that memory to himself. "Wait, was it supposed to be a memory of yours?" He waited for her to look at him, but she couldn't as she slowly nodded yes. "Then you would have seen something from my memory?" He said calmly. Once again she nodded.
He watched as she began to cool down, and looked at him directly. "I don't remember what I saw of yours, Shirou, but when I do I won't ever let you live it down! You better tell me what you saw when that time comes!" She began to swat him with the pillow once more.
"Yeah, whatever you say" He smiled, knowing that maybe at that time, she'll finally admit what he has always felt for her.