My Secret Fantasies and My Wives Ignorance

I'm 45, been married for twenty years to my wife Emily. We have two kids together. It's a stable life, but lately I've felt this deep urge to explore something more taboo. I think it started with those old bondage videos from before we got serious, back when I was still single and experimenting. Just the thought of being tied up by a stranger has my blood boiling these days. So one night, after the kids were asleep and Emily's out volunteering, I booked an hour-long session at that new BDSM place downtown. It felt so freeing to walk in there alone, ready for whatever they had planned. A burly man with tattoos greeted me and led me into a room where he blindfolded and restrained me. The sensation of being utterly helpless turned me on more than anything ever has before. He started out gentle, asking about my limits and what I wanted to experience. Then it escalated quickly as he spanked my ass hard until the skin was red. Every impact felt electrifying through the leather straps biting into my wrists. His hand snaked between my legs and found me ready for more - his fingers sliding inside of me rough and deep while holding the blindfold tight so I couldn't look away from the ceiling. I lost all sense of time or reality, just feeling everything in this moment. Emily has no clue about any of it - she would never understand my secret craving to surrender control like that completely. It was exhilarating but also left me wanting more each time. Telling her would ruin what little distance I've managed to keep between our marriage and these fantasies. I don't know how much longer I can hide this side of myself from the life we built together though. Every night I'm tempted to search for another session, let them do even harsher things to me until it's all I want. But I have responsibilities now that preclude that kind of risk and secrecy. So I struggle with it internally, pushing it down during the day as a good husband and dad but letting myself escape into those dark urges when she's not around. It's isolating being so split in two like this - having these intense kinks my wife will never share or accept.