My strategy is not to be upfront about this on my Tinder profile other than to state I'm kink friendly, but instead I go on a few dates and only after we have sex do I typically reveal my fetish and basically just see if she is into it. If she's not at least curious and open minded then I don't pursue a relationship and keep meeting new matches off Tinder.
I've had several serious relationships where I successfully encouraged my girlfriend to cuckold me. Some of the earlier experiences were rocky as I wasn't always in control of my emotions and jealousy, but after my first cuckold relationship the rest were very positive and healthy. Cuckolding added to the relationships and they eventually ended for other reasons.
Although I've always found humiliation, sph, caging, and denial extremely hot, in my previous cuckold relationships we tried some of these things but never went very far.
I noticed in my previous cuckold relationships that the only regrets I had were not going further with more extreme aspects of this when the opportunity was there. One of my ex's had a bull that had experience dominating other couples for example. And even though one part of me wished she would humiliate me and call me a bitch or something while I sucked his cock, I was always afraid to really emphasize that I liked the humiliation and so mostly they just had vanillish sex while I watched.
Anyway, after having been single for months now I've recently started seeing a girl I'm super excited about. And this time if I have any regrets I will make sure they are the opposite regrets!

Basically she is very kink curious and quite promiscuous but with no previous experience cuckolding or with most fetish stuff. From our first date we were talking deeply, openly, and honestly about all kinds of different fantasies we've both had and how we could potentially structure a real and long-term relationship around our kinky fun.
Most importantly, I really like her for a lot of other reasons. I would be excited about meeting her anyway but then the potential sexual fireworks have me really excited. We've gone to bed together several times so far and every time I licked and fingered her and made her cum while she did not reciprocate at all. This really surprised me the first time I got her in bed because even after all we discussed it still seemed naturally like we were going to have sex that night. And then when we were already naked in bed she told me no! It was so hot, we had talked about denial at dinner and I told her it was a huge turn-on. And she was actually doing it and enjoying it too, right away!!
The second time I got her in bed she had me lick her while she swiped on Tinder and commented on some of the guys and how she'd probably just fuck them right away on a first date. I didn't even specifically ask her to do this but she knew from all we talked about that it would drive me crazy and it absolutely did!
I am falling so hard for this girl and just last week I asked her to be my girlfriend. She agreed and I deleted my tinder and am happy to now be exclusive to her BUT we haven't even had actual PIV sex yet and after the talks we've had recently we are commiting to maintaining that indefinitely.
Our "sex" and intimacy will come from me licking her, cuddling and making out, and maybe other things that will evolve over time. But we both agree that sex and blowjobs will be off limits to me in this relationship while very much available to other men she meets.
So that's where we are at now. She's been swiping on apps and chatting with guys. So far most are duds as they usually are, but there is one she just matched with who has a lot of sexual experience, is black which is an extra turn on for me, and definitely bigger than me. He says he is quite dominant also which is something we are both looking for but so far he's been very respectful in their chats which she likes.
I'm super excited but trying to be realistic too. This is still very new and could easily go sideways. I honestly have no idea if even going this "extreme" with the fetish right away in a new relationship is wise or sustainable. But right now I'm almost trembling with excitement at the possibilities.