Riley found a box labeled "BIKER", as he was opening it he saw what looked like a complete biking outfit. He pulled off Nick's diapers and put on a pair of leather pants. Overall they were made out of thick black leather, with pockets on each thigh as well as knee protectors. An elastic belt was gently pressing against Nick, who literally grew into them as he was changing back to his adult form. Quickly his skin was pressing lightly against the leather which caused him to get a mild errection. "Ohh those pants feel nice", Nick said and continued, "but I think I can dress myself now" before reaching for the next piece.
This time it was a black leather jacket. It had pockets on its chest and sides as well as a zipper. The elbows also had a bit of protective padding sewn into the leather. As he put it on, he visibly grew in bulk gaining some muscle, which he quickly hid as he closed the zipper. At first he could feel the leather against his skin, but then it seemed like it was fusing with him, becoming a second skin.
Next were the boots. They also were black and had a set of straps each to adjust them. However no adjustment was necessary as his feet grew into the right size and shape to fit them. What was left in the box were the helmet as well as the gloves. He pulled out the first and put it on. It was matte black, with a large visor that flipped up, showing his whole face when worn. A little microphone was visible coming in from the side and indicating that it was equipped with an intercom. As he put it on he grew a mustache and his face turned even more mature. Quickly the weight of it became unnoticeable, though whether this was because of muscles growing on his neck or other reasons was unclear.
As the last part he put on the gloves. They were, like the rest of his outfit, made out of black leather. Curiously, even though they were rather thick, he could still feel through them as if he wasn't wearing anything at all. Examining them closer he saw that on the back of the left hand there was a little display as well as some buttons. Pressing them he noticed there was some sort of menu. "Hey look at that", he told Riley who simply grabbed Nicks left hand and started to play with it.