Lock him in latex kigurumi suit of Cynthia

Avery stands there, too dazed to understand what's happening. You order the Shamrocks to restrain him and, once they do, you snap your fingers. Avery is brought back to reality, before asking questions.

“Where are we? Are we even in Galar anymore? What did you do to me? And… how did you make me want that so badly…?”

You say nothing in response, simply grabbing a latex costume from your closet. You bring it over and set the different pieces down in front of him.

“Is that…?” Avery asks.

“Indeed it is.” You answer. The kigurumi suit of Sinnoh’s champion, and it’ll be what Avery wears for the rest of his life. The nanobots built into the rubber of the suit will make sure to feed and clean him, they can even repair fatal wounds and stop **** by physical damage. It will also destroy any bodily waste without it staining the suit. Not only that, but the suit fully stops aging and is impervious to all types of physical destruction. That means anyone unlucky enough to wear it will become immortal. The suit won’t even allow you to escape by ****. As you strip Avery naked while the Shamrocks hold him in place, Avery notices the first part of the costume: the pants. Despite being made of shiny rubber, they look exactly the same as Cynthia’s black pants. With one exception. After you strip Avery naked and begin sliding the pants up his legs, he sees the null bulge in the pants’s crotch area. The red padlock symbol of the nulge contrasts against the black of the pants.

“What is that for?” Avery asks, half-scared, half excited. Again, you say nothing. You allow him to see for himself. The pants are slid all the way up, leaving Avery no longer nude. Nudity, however, will become preferable to the hellish edging the suit will put him through. The pants fully adhere themselves to Avery’s legs, almost printed onto them. As soon as they finish adhering, the null bulge starts vibrating, prompting Avery to start moaning.

“Ah… ah… ah I’m about to.. Tooooo!! …Huh? Why did it stop? I was so close!”

“Get used to it,” 02 tells him. “The suit is designed to make life unbearable. One of two ways it does this is by teasing you, but never allowing an orgasm. And if you think that’s bad…”

“Hnnnnnngghh!” Avery groans, teeth gritting, as the suit’s built-in inflatable buttplug inserts itself into him.

“...Just wait until you see what that buttplug is for." 01 says, picking up where 02 left off. The “shirt” is then applied to Avery. The “shirt is a replica of Cynthia’s actual shirt, in addition to her hands. The “shirt” then fuses with the pants, removing any hope of escape Avery may have had. Lastly is the mask. This is where the buttplug becomes diabolical. The mask of the suit has a dildo gag, but that’s not the cruel part. When the wearer exhales, the plug inflates to enormous size. But, when they inhale, the air they suck in will deflate the buttplug. You take your time with putting the mask on Avery, enjoying his pleas for you to stop and to be freed from the suit. The mask itself is finally applied, as it becomes one with the rest of the suit and encases Avery’s hair with fake yellow rubber hair resembling Cynthia’s. Avery is let go by the Shamrocks. With one hand, he attempts to remove the mask, fruitlessly tugging and stretching the rubber, only for it to snap back into place. His other hand is occupied with frantically squeezing his bulge.

“Enjoy your new life… ‘Cynthia.’ Avery rushes to the door, but stops, as if realizing. Where would he go? Defeated, he submits himself fully to you.