Dream (hopefully realistic):

Have enough money to have a nice house built and retire early in it with my wife. The house would have a rotatable fireplace that reveals a large enough dungeon behind it for us to occasionally host parties for our local BDSM scene.

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Fantasy (completely impossible):

Romantically snuffing a willing partner during sex, preferably by asphyxiation, preserving the head to hang on the wall, donating or selling their organs for medical reuse, and cooking/eating their meat, all without any remote chance of legal repercussions. There would be a new volunteer whenever the previous person's meat gets low. These partners would be healthy adults of both genders without body hair. Each person would see the heads of all the previous people on plaques on the wall, with their names, dates of birth, and dates of snuffing.