Although I agree with Mac, I come across a lot of ads like clay's. I think that anytime a couple is formed in order to have a cuck relationship, it's not really a cuck relationship. The man alone can look for a ladyl who he hopes can cuck him in the future, but if he spells out his desire to be cucked before the relationship even starts, he's not really a cuck.
Look at clay's second scenario, where the guy already has a lady and then clay will enter as the cuck. Call me crazy, but in that scenario I would consider the other dude to be the cuck. Afterall, clay is the outsider.
I don't subscribe to the theory that you have to be a husband to be a cuck (although technically it's true), but I believe there at least has to be a standard relationship at the beginning before you can become a cuck in any true sense of the word.
clay, just try to find a regular gf. Once you do, give it at least a month or so before you start pushing her towards cucking. If she doesn't bite, then break up and look for another. Baby-steps, dude. Baby-steps.