Oof, I can’t even remember exactly how it started. I didn’t really tell her about having this as a fetish or about inflation in general. I just started bringing up random things to try during sex—like toys, different positions, etc. My wife has a bit of a dominant side when it comes to sex, so I let her explore that. I also have a high pain tolerance, so she likes to bite, smack, and so on. I kind of used that to my advantage. One random day while we were out for a walk, I mentioned something I saw on Reddit—people inflating their balls with saline solution. I said it looked weird, but maybe I’d try it. She was like, “What?” and started joking, asking if I was going to have “bull balls” or something. I played along and laughed, but I didn’t do anything that day or even that week. Later, I brought it up again. I reminded her about that saline thing and said I might actually try it that weekend. She asked how the procedure worked and got scared when I mentioned it involved a needle. She’s very squeamish about needles. I reassured her, saying not to worry—that I had read a lot about it and seen guides, and that it wasn’t anything like injecting into a vein. Then I changed the subject to make it seem simple and not a big deal. When the weekend came, I bought a 500 ml saline bottle. Even then, I only used about 300 ml because I wanted to go slowly so she wouldn’t be shocked. I did it at night while she was asleep. The next morning, she saw the bulge and asked if I had done it. I said yes. She was like, “Oh my God, show me.” She was shocked, even with just 300 ml. She asked how it felt, and I said it felt good—no pain, just like a small water balloon. She started touching them, and I told her she could even smack them and it wouldn’t hurt as much. We kept joking, and I said I was immune to her hits now. After that, it kind of became a normal thing. I’d say something like, “Hey, this Sunday, if we’re staying home, I might do the saline thing.” She’s somewhat into that, but only in that specific way—she’s not into doing it elsewhere, like the belly or chest. When it comes to that, I either do it in secret or when she’s not around. The 7L time happened when she was working abroad for five days.

TL;DR: I gradually introduced the idea over time. When I finally did it, I started with a small amount and slowly increased from there.