This has got to be one of the best sci fi romance scenes ever done. The score is simply magical and the scene itself is romantic love in its most pure form imaginable.
Odo transforms into some sort of...energy being? to link with Kira, this is after the drama with La'as and the tension created therein. Kira's request "I want to
know you"-I think speaks to what people really really want when they talk about love.
Not simply physical or emotional affection, not simply action-but to truly
know someone, their inner thoughts, their mind, soul and body-completely and totally, "two becomes one"-in the most literal sense.
In the real world-this isn't possible, we can't "link" with spouses or SOs, but this Trek episode shows just that. Merging, uniting, becoming one.
Sorry-the scene brings out my inner romantic.