When Caesar crossed the Rubicon river he famously declared "the die is cast" because he knew he would forever be subject to the consequences of that one irreversible act.

Even after my long term gf had cucked me a few times I always felt in control and as if this was some highly erotic dream I could wake up from or a situation I could reverse or a desire I could possibly suppress at will.

Then one day I had my Rubicon moment.

She wanted to see a tinder date a second time, was sitting next to me on the couch talking about him, and I could sense how giddy she was. I knew he was big and dominant and I'd heard her session with him and it was intense. I was painfully hard in my jeans and she said she needed to ask me something. She showed me her sex chat with him on WhatsApp and wanted me to tell her what she should say. He was telling her that he loved how she sucked his balls but expected her to suck his ass the next time. She's never done this for me.

I said wow and asked her what she wanted to do. She said she wanted to try this for him but wanted me to be ok. This was my landmark moment. I agreed she should. I was painfully hard at this point. She immediately wrote back "yes, can't wait."

At that moment I came in my pants. I didn't even realize what was happening at first. Really it was a shock. But I knew instantly that I'd never be able to put the genie back in the bottle.

Anyone else have a landmark moment after your first few experiences when you knew you'd forever be her cuck?