Luke's curiosity got the best of him and stood up, holding the paper on hand. He followed the instructions.
He strip down all of his clothes, including his underwear, leaving his nude body exposed to the night breeze. He has a well-toned body, not too muscular, but not too fat. His nudity also meant that his dick is also exposed. He felt embarrassed, though knowing that the park doesn't have anyone inside by the looks of it. This weird feeling of exposure also made his dick erect, which is helpful for the next step.
Luke took the object, and before doing anything else with it, he inspected it. The outside of the ring has a white color with black ridges, looking scientific and fictional. The inside is all black.
"Well, here goes nothing I guess."
He slowly inserted the device into his penis. The cold feeling of the device made him shiver a little bit. As the device made contact with the tip, he noticed the black material started coming off of it, kind of like a sci-fi condom. The material feels gooey, almost like latex, and pretty glossy. Moaning in pleasure, Luke continued to pull the device unto the base of his dick, and pressed it.
He took a look at sci-fi latex condom now covering his manhood. It's shiny and tight, but also a little bit slippery and gooey.