Mac stared at the picture for a long time, smiling a little when his picture self pulled Colin past the frame and they reappeared a few moments later with suspiciously full lips and messy hair. He remembered the moment the picture had been snapped. He'd managed to sneak away from Auror training, to warn Colin and Dennis about the Muggleborn registration. It had been the last time he'd seen Colin until the battle.
Finally, he managed to write a quick note back.
Colin,
Thank you. I love them. They bring back nice memories for me too. Best birthday present I've gotten in a long time.