Alex whimpered helplessly. He was standing in front of his girlfriend Yuri, fully naked, wearing nothing but a leather collar. He had his legs spread open and his hands behind his head- and his cute, twitching cock stood stiffly erect, making him even more ashamed of himself.
Yuri giggled, slowly tracing her finger in a heart shape over his chest. "So cute... I think we need to set some ground rules, don't we, Kitty?"
Alex mumbled, "Alright..."
Yuri frowned. "Rule one! You're my Kitty and I'm your Master. You'll do what I say, you'll always tell the truth, and you'll address me as Master. Is that clear?"
Alex looked away. "Yes..."
Yuri grabbed his chin and forced him to look her in the eyes. "Yes, MASTER."
Alex stammered out, blushing, a hesitant "Yes, master."
Yuri gave Alex a quick, teasing peck on the lips, leaving him with a tingly sensation all over his desperately horny body.
Yuri smiled. "See, if you're a good kitty, I'll give you treats... but if you're naughty... I get to punish you!"
Yuri stepped away and looked Alex up and down. "Second rule! Good kitties don't act like humans! You're not allowed to speak normally unless I ask you a question, and even then you should add 'nya' or 'meow' at the end now and then. Kitties don't get to wear clothes, only cute collars and fun trinkets that Master gives to them. They walk on all fours and pee in the litter box, unless the Master has said otherwise. Oh! And here's your cute costume!"
Alex whimpered as Yuri put a set of black cat ears on his head, as well as large padded cat paws on his hands and feet. Then Yuri held up a tail attached to a buttplug.