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"Sherlock this is Gregory." Mycroft's said more out of politeness then anything else, Sherlock had probably already deduced the elder teen.
"What is it Sherlock?" Sherlock had begun laughing as he turned to stride away. "You both want to snog each other, it amuses me that you're both oblivious to that fact."
Mycroft blushed, but Greg shrugged leaning in close to his friend and placing a short chaste kiss on Mycroft's lips.