"Whoever you are, tell me! I will punch you otherwise". Wow, that came out VERY awkward. Somehow, it scared Cassie(or whoever it is right now). "OK! OK! IT'S ME, LUI. DON'T PUNCH ME. I TELL YOU EVERYTHING.
...
After the long story, Lui has explained that he somehow turned into Cassie using the ring he found. You were relieved that it was someone you know, although it's weird talking to a child who looks like a hot girl. Then, tears came out from Lui's eyes. "Waaaahhh! WAAAAAAHH! I'M SUPPOSED TO PRANK YOU! NOW IT'S RUINED!", he cried out.
You panicked as you don't want your other neighbours to wake up. You tussle his hair just like you always did when he cried in his old body. You feel a little excited to touch Cassie's silky smooth hair but tried your best not to show it. "It's not you fault, Lui. You just have to try later". It may seem childish, but he is still Lui after all. Then, he started to calm down. Silence, fills the room as Lui's head is leaning towards your chest. You really tried hard to hold your boner.
"Hey, Lui. Wanna play something?", you said to break the silence. Lui's eyes brighten as he stands up and starts to jump joyfully. "Let's play tag!", he said, not noticing his big breasts keeps clapping his chest. "Hey, Lui. Stop jumping! Your gonna hurt your chest with those boobs of yours!". You're surprised that didn't hurt him a bit. Guess Cassie's body build up a tolerance against it.
"So, that's what they're called! BOOBS! That's so funny", he said laughing. "Anyway, wanna touch them bro Vin? They're really soft like pillows!", he said smiling. "First, just call me Vinnie. You're big now. Second, don't you know that guys are not supposed to touch girl's boobs?", you said ashamed. You know you have no right touching this beautiful body, especially if it is a pervert like you. "Then, I wish you can touch their boobs whenever your want. NOW. TOUCH. IT!". Lui pulled both your hands to his breasts. You were surprised and tried to pull away but Lui insists on you touching it. With no choice, you started to fondle his breasts. Lui's moans a little but tries to act tough. "See, nothing to be afraid of. Plus, you love it!", he said happily. You fondle his boobs until a bra tag come out from his bra. "Wow, DD cups! No wonder the bra didn't make it stay in place!". "What's that supposed to mean?". "It means that your boobs are one of the biggest size in the world!". "Huh, only one of? THEN, I WISH IT WAS THE BIGGEST IN THE WORLD", Lui said in a kingly manner. Then, his boobs grew to what appears to be a K-cup! His boobs barely fit his bra.
Cassie's face, newly owned cleavage and you touching it right now, made your boner very visible where it's no point hiding it. "Gotcha! You wanna pee!". You suddenly blurted out "Man, I really wanna have sex with you!", to which you quickly closed your mouth, not believing what you have said.
Lui, looking at you innocently, asked what it is. "Well, it is a type of game that happens when you have this", you said pointing at your erect dick. You didn't want to tell the truth because after all, he is still a kid inside. "Is that different from when my peepee goes hard whenever I want to pee?", he said in a childish manner. "Uh, yes. Usually, during sex, it will pee out special white pee. Then, it goes down", you said, very embarrassed. You tried to excuse yourself to the toilet but the Lui stopped you.
"You said sex is to make peepee go down, right? Then, how can we do it", Lui said commitedly. You flustered and said, "W-Well you need to be doing it with someone you love. But we can't do this. You're still a kid!". "Hey, you love me in Cassie's body, right? And I'm big now, thanks to this body. Now, I must help your peepee go down. Pretty please?", Lui said, continuously begging and annoying you.
"Can you atleast alter your memories to know it?", you said. "NUH UH, its boring to already know the game. Let me try it first", Lui said confidently. He insists learning it along the way. On the good side, you will be having your first time with the girl of your dreams and having her boobs double in size. On the other hand, the one experiencing it will be a kid, and thanks to you, he's gonna learn it way to soon.
Should you have sex with Cassie knowing its the innocent boy, Lui and practically raping Cassie, or would you try to convince Lui first into having second thoughts?