One of my subs enjoys the threat of it, though both of us know I would never actually do it. Keeping in mind that real blackmail IS illegal, the fantasy of it is not uncommon and I think it's fine to indulge it as long as clear boundaries are discussed and established. From my side, I have screencaps of him consenting to that type of play just to cover my own butt, but from a sub's perspective I would say only do it with a domme you really trust.
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