I'm terribly obvious when I'm all
over someone. I also feel inclined to tell them, even if they don't feel the same. It's not an attempt to sway them and I keep awkwardness from it, but it's as though they
neeed to know. It drives me nuts to feel like I am witholding my feelings and thoughts from someone I care about.
It also triggers a desire to give to them. I begin to associate and pinpoint things I see that they might like. I'm inclined to show said love through gifts, crafts, notes etc. In a way, it takes over. If someone misses it, they are ridiculously oblivious.
The few other ENFJs I know are also very obvious. I'd say it's because we are emotionally intense and emotionally open. We'll make attempts to hide the intensity, but love brings it out full-force. Flood gates and all.