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Who said passion is only sexual or blood-lust? People argue passionately on these boards about rogues. People get passionate about food, sports, and other things. Hand feeding an eunuch a morsel of fine food could be sufficient. Or even delivering a good cup of coffee.
Because let's suppose a paladin was to passionately do his/her divine smiting business, and proceed to discharge the full content of a tanglefoot bag at said succubus, the thrower wouldn't be drained, as per RAW. And I assume unloading a sack of sticky substance all over someone else is an act of passion.
In fact, being engaged in melee without actually grappling doesn't work either. It's only fair to assume physical contact is required, which is why "acts of passion such as a kiss", while probably applicable to any mouth related grappling, cannot be expanded to non-touch passions, unless we add in a house-ruled template.
Let's say we open up an extra-planar brothel called Moores. "Well made, well priced, well dressed". There's this succubus poledancing that would only need to have foes fascinated to be able to energy drain them. A few levels of bard and she could easily drain audiences.