"He knows that I would get upset by seeing the photographs," Sherlock answered with a heavy sigh as he buttered up the toast. "He knows I care about you. And he knows you would be embarrassed about me seeing them. And you do realise, John, that this...what we're doing now..." And he popped his head back round again to look at him. "This is exactly what he wants. Us arguing, falling out over a stupid picture."
He returned to the kitchen and opened up the jar of jam, spreading some out onto the three pieces - two for John and one for himself, rolling his eyes as he heard his friend going on about deleting the picture again. He could just imagine John's face right now, he smirked slightly.
But despite everything, John's request tugged at his heart strings slightly. John had said please, that it was a personal favour. There wasn't really any way he could ignore that, despite any misgivings he might have. Their friendship would always come first, before anything. Sherlock gave a small shrug. He was planning to kill Moriarty anyway, so why would he need evidence against him. Dead men don't go to court.
Having finished preparing breakfast, the detective picked up the plate and carried the two pieces of toast through to John, popping his own one into his mouth. "I'll delete the picture," he mumbled whilst eating.