(Yeah, I was thinking hedgehog for a bit? xD But than I though something like a Golden Retriever would fit John's personality way better. :3)

John chuckled. "I just met him on the train." He looked over to his friend, with a little roll of his eyes. "For a genius, Sherlock, you sure act like quite the little kid." He said, with a little smile. He poked him lightly, scooting over closer, and looking down at the water with him, a curious gleam in his eyes. "What are you even looking at?" He whispered quietly, just so Sherlock could hear. "I don't see anything. Looking for mermaids?" He said teasingly, poking his side again. He didn't want him to be all huffed about something so silly. He hoped he hadn't actually made Sherlock mad... That thought gave him quite the little nervous shiver. He'd really like to have Mycroft, Lestrade, and of course especially Sherlock as his friends. He had a feeling it would make a lot of things much easier for him in the long run. Not to mention they were all really nice and interesting, and he hated to think that he'd screwed it all up just by being kind to someone.