When I personally tried to quantify romantic attraction, I guessed it would feel like a kite that had that weightless feeling that simultaneously buffeted you up and tossed you about but would still feel fun. When I asked my brother he said “wanting their love and acceptance in a way that is different from friendship, wanting to see someone completely, their flaws and their strengths.”
By contrast I imagined a platonic relationship to be less dramatic. The imagery I used was a picnic table. Relatively stable and reliable but still something that you have fun around.
I don’t know if that imagery is helpful. I always found imagery and metaphors to be much better at describing what I was feeling.