It was a very complete neko costume for bedroom wear, with the cuteness and sexiness factors being mutually reinforcing. It included some amazingly kinky-looking lingerie complete with stockings for both legs and arms, a very cute teddy, a kinky-looking black lace cat-ear mask, a butt-plug tail, a very sleek locking chastity device of the tuck-away style, lockable bondage mitts in the shape of kitten-paws, and lockable ballet slippers in the shape of sleek black kitty-paws. Much of the neko costume was made out of very fine lace, and it looked like it would tear from just looking at it too hard. Upon touching it, though Adrien found it felt surprisingly strong to the touch, showing it to be made out of incredibly high-quality material. "What is it made of?" he asks as he fingers and tugs at it, finding it to be impossibly strong.
The man chuckled softly at the boy's question, as if it could have been deduced by mere observation. "The transformative agent in this costume is the sound of a cat's footfall, which is woven into each component. Structural components include the roots of a mountain, the beard of a woman, the sinews of a bear, the spittle of a bird, and the breath of a fish."
Adrien scowls. "Well, come on, now!" he protests. "Each of those things is impossible!"
"Very astute, boy!" said the man excitably, "very much astute! The butt-plug tail was the most difficult component of this one to design. Do you realize how difficult it is to find mountain root with the right balance of malleability and strength to produce a comfort-tunnel for bowel-movements?"
"Ewww!" Adrien retorted. That sounded unbelievably gross on every sane level, but the boy was also really sort of fascinated by the idea. Not having to take it off...
Seeing Adrien's awakening interest, the man took the boy by the shoulder and led him over to the counter. "Well, it's your lucky day! We have a special going today. For only a twenty-five year lease on your soul..."
"My soul???" Adrien asked him. "Whoa, dude. I am not going to be selling my soul, so you can keep the goofy costume." He turned to walk from the store.
The man quickly began unpacking the costume as he muttered, "It was only going to be a twenty-five year term, and the going rate is usually half a century, which still leaves plenty of time to seek atonement for a little bit of harmless demon-worship. Most of our customers choose to extend their terms to a century, finding devilry and wickedness to their liking. If you insist, though." He made his way to the back of the store where he had gotten the costume, obviously not too much put out by the loss.