Sirius grin stretched. Moony's reaction or rather lack of reaction was just priceless. Damn, his friend was very talented in the comedy department.
"What Moony here wants to say is: Hi Nymphadora, it's awesome to meet you," Sirius said, stepping forward and lying an arm around Remus' neck. "You may also notice the blush on my friend's face," Sirius continued, imitating the voice of a professor. "This means that he is too shy for his own sake and has no idea what to do with a woman or how treat her."
He leaned forward into Nymphadora's direction and half-whispered, "the poor bloke never had a girlfriend before." He looked back at Moony who did not seem all that happy with Sirius' choice of words. "If you ever see that look on Remus face, by the way, it means that he is about to murder you. Something I rather want to avoid." At this, he stepped a few feet away from Remus. "I like being alive, therefore I will just stay here and be mostly quiet."
"You are allowed to talk, Moony. Just if you haven't figured that out yet..." Sirius continued the teasing.