This is exactly what happened. I started wondering why I thought it was exciting/arousing in the first place. I haven't tried again and I don't feel like I want to.

I think it's because I have to act it out with whatever random objects my ego chooses for the "obsession". Can't help feeling it would be a lot different with a boyfriend. When I fantasise about M, it is much better, but obviously I can't act it out with him. I've had a few fantasies about him recently, but I haven't with the obsession object, not since that time I tried. I feel like I've lost interest in that in a fetish way.