During a mission on a planet that seemed perfect, the landing party explored but Spock was sprayed by a plant and fell unconscious.

The captain and the others quickly took him back to the starship. He laid down as Mccoy spoke

It seems to be spors, they send hormones, infect the brain. They will pass in give or take 2 days but until then I am not sure how he will react.

He slowly gained consciousness and locked eyes with her. What nobody knew was that the spores acted like a love potion