You get a swap cockring from a longtime friend. You meet him at a low-key meeting into his work's parking lot. Arthur is a childhood friend who become HRD for a large financial company. Wealthy, he could afford this very expensive ring. He lends it to you for a week and orders you to not talk about it.
You open the small black box and see a simple metal ring placed on dark blue velvet. Arthur gives you the URL to download the application on your phone. Once you've done it, you go to your apartment.
Your dick is medium sized. Circumcised and upwards curved. You are not ashamed to show it to your lovers. Your shame is more about your overly pendulous balls. You don't like them because you think it unattractive.
Your boyfriend Alexis is taller than you and yet less endowed. His dick is thin and half an inch shorter than yours. He is uncut with a long foreskin. His dick is not curved, it points straight up. He doesn't like his balls because he thinks they're small. Which is sadly true.
Alexis jumps on you as soon as you walk the door. He wants to know if you got it. With a broad smile, you take out the box of your coat. You have to calm him and reminding him you will be the first to test the ring.
You undress and throw your clothes on the couch. You slip the cold ring along your flaccid dick and your balls. You sit on the couch with your boyfriend glued to you. You take your phone and launch the StarDust app. The interface is simple. Only one text box and a "swap" button. At screen's bottom you see "options" and "help" buttons.