I got my wife of into scat after eight years.
We met 8 years ago. She was rather kinky for the first year, then our sex life tapered off and was kind of meh with a few bright moments scattered(no pun intended) in-between the bleak stretches of boredom. She showed no interest in scat/pee or anything, tho. She was more into choking and CNC. Even had a threesome with her girlfriend back then.
On our wedding night, while she was drunk puking into a toilet, she invited me over to fuck her as she was doing that, and in the morning, she told me she liked it. Later, on our honeymoon, when we were alone in a cottage for a week, she didn't want to do anything, to my bafflement and disappointment.
Over the years, she became fine with me being around her while she was on the toilet, but we were only talking or cuddling, nothing sexual.
She also discovered my scat/vomit porn stash and reacted better than I would have expected. She asked some a few questions about what was the allure of it for me, in an inquisitive, scientifically detached way, and nothing further came out of it.
Over the years, we discussed it a few times, and she once let it slip that in order for her to let me pee on her, she'd have to be really drunk. That was my clue. She didn't say she doesn't like it, she said that her inhibitions would have to be gone.
Years of mediocrity later, a few weeks ago, I agreed to let her act out some stuff she wanted to try. Pretty vanilla, just some RP of me begging her to be allowed to eat her out and she cursing me out, ridiculing me, and slapping me a few times. I decided to push it a little bit and begged her to eat her ass, too.
Yesterday, we're just sitting on the couch, and she asks me to call in sick(something I hate to do bc I like to save those sick days) and help her clean up the house(which is a long time overdue). She straight up offered to pee or poop or me if I gave her that sick day. Then we talked for a while about what I like about it again, about what she likes, about our exact limits, and about the logistics of where and when to do it. She also mentioned that while she wouldn't agree to let me shit or pee on her yet, I understood from how she talked about it(apprehensive and nervous, not disinterested or genuinely disgusted) that if we got into it, she'd be fine with it after a few sessions.
I think it's a ploy on her part: She wants it, but she's too shy to ask to piss and shit on me directly, so she's creating an excuse for herself and an incentive for me to press her into making good on her end of the deal. After all, I did something for her and now I demand scat sex as payment, so it's not like she's a perv too, oh no, she only had to do it to pay me back.
We didn't get around to it yet, but for our first session, I'm going to suggest that she drinks a lot and pees on me while again humiliating me and laughing at me for being a disgusting pervert, so both mine and her kinks are included. I think that would be an easy enough segue into genuine scat sex.
So there you have it. Talk to your partner and let them do stuff to you, and they might just let you act out your fantasies. I really hope that this is a sign of our sex life truly taking off.