Helping My Traditional Partner Understand My Fetish Dynamics

Hello, My ex-keyholder and I have split up. Things are much better now, with a totally different dynamic between us. We’re having plenty of sex, mostly initiated by her. She’s told me she’d prefer if I took the lead more often, and she also said, “I won’t say no to sex.” Her only way to reach an orgasm is through PIV missionary-style intercourse; cunnilingus isn’t really for her. She comes every time, after which I finish inside. She’s rather traditional and vanilla. Their orgasms happen exclusively during penetration, making the relationship quite fulfilling. The issue arises here though. I like wearing my cage and sometimes put it on just to enjoy myself when we’re apart. I took a few photos of myself locked up, including some showing an erection. We were away for the weekend, had breakfast together, and snapped a selfie. She has a habit of reviewing all her pictures in apps before deleting the originals from our phones. Unbeknownst to me, she found those caged, erect shots in my trash folder. I managed to calm her down about it, but I didn’t fully explain what the cage was for. She seemed quite puzzled by it. I want to be open with her now and perhaps reveal some of my other kinks (yes, she is vanilla, which makes talking about sex a bit stiff). What should I say? Our only real shared kink has been CFNM. When we’re alone at home, she’ll ask for “naked coffee,” where I appear completely nude. I love that routine. We’ve had some trouble discussing our preferences and exploring further. I once asked if she’d like one of us to be tied up, but she didn’t seem very keen. I appreciate your input.