Invite him to test out his new contraption!

You exchange a few messages with Ji-Woon and send him the money to make his invention. A few weeks later you've settled into your life as caretaker and manager for your dad and brother's new lives when Ji-Woon messages you that he finished his prototype. You get him a plane ticket and fly him over to your house and today was the day as you hear the doorbell ring. You get up from your desk and give your dad and bro a good pat on their enormous bellies as they feed and entertain their followers. You open the door and find Ji-Woon looking very excited. But then his eyes slowly made their way downward.

"Wow," he said under his breath. You look down and realize you are naked and your enormous package is swinging free.

"Guess I'm a little too used to this!" You say rubbing the back of your neck. "But I guess you would be too since you watch the streams."

"Yeah, It's just incredible to see in person," he says. You notice he has a huge crate with him on a cart. That must be his invention. "But, I'm here to give you this!" he gestures to the crate. You help him bring it inside and he takes off the lid to show you a massive blanket. "This is my invention for your dad! I made one for your bro too. It's like an electric blanket but instead of heating, it vibrates intensely!" He demonstrates by clicking a remote control and the blanket vibrates powerfully in his hands.

"Let's give this a try then," you say as you walk to your desk and press the button to lift your dad's and brother's bellies. They lift slowly revealing their mammoth genitals.

"Can I!?" Ji-Woon asks excitedly. You gesture toward your dad and Ji-Woon eagerly heads underneath your dad's enormous belly. He begins wrapping his blanket over your dad's cock.

"Oh! What is this?" You hear your dad say muffled over his flabby body. You help Ji-Woon and grab your dad's cock lifting it up so Ji can wrap it around completely. He fastens it so it stays on as the two of you step back and he allows you to hit the button. It begins and your dad immediately begins to howl in excitement. The vibrators in the blanket loudly buzz as they pleasure your dad until in just moments he orgasms.

"Holy shit!" your dad screams. "That's what I needed! Oh, don't turn it off, son!" You congratulate Ji-Woon on a job well done when he asks to play with your dad's meat. You let him as you go put the other blanket on your brother's cock and turn his on. Together the two of you work on your dad's cock pleasuring him to finally satisfy his monster meat. Ji also helps himself to some of your manhood bringing you to orgasm multiple times.

Finally, night comes and Ji-Woon is on his way. You pay him extra for his invention and you invite him to share any other ideas he has with you, as well as call you whenever he wants as you share a passionate kiss and he jerks you off at the front door. You head back inside and your brother and dad are still enjoying their hours-long masturbation session and eating everything they can get their hands on. You go up to your dad and play with his fat and grope his cock before heading to bed.