The Dark Side of Bliss

I've been in a long-term relationship with Alex for over five years now. We have a great life together, we support each other through thick and thin, and we've grown so much as individuals and as partners. But lately, I’ve started exploring a darker side of myself that terrifies me yet exhilarates me at the same time. Last night, after closing up late at the café where I work, Alex surprised me with handcuffs and a blindfold. They said they wanted to experience something different tonight. I was hesitant but also felt this magnetic pull towards it. Once we started, the feeling of being restrained, the thrill of not knowing what was coming next, it overwhelmed my senses. It left me shaken and questioning everything in the morning light. Am I losing myself? Is this normal for couples to explore such extremes together? How do I keep these darker desires from tearing us apart?