soundwave knew you had weird kinks and since he had a crush on you he took his chance while you were flirting with him and teasing him about being a good "pet" . You were telling him how good you would be to him and he got an idea; he reached for something in his subspace and put it around your neck... it was a collar attached to a leash...~ "oh yeah? You're a good girl/boy~? So be it~ call me master~" he sat back down on his big chair pulling on the leash a little,blushing a lot