Falling in love is the easy part

TED TALK

stick out - to be noticeable or easily seen 
They wrote the notice in big red letters so that it would stick out.

promptly - without delay
She deals with all the correspondence promptly and efficiently.
Fortunately, the paramedics arrived promptly and were able to save my father.

inadvertent - done by accident, without being intended 
I wonder how many inadvertent inventions were developed in the process of trying to discover something totally different.
Probably the most horrific consequences of violence are the inadvertent injuries or deaths of innocent bystanders.

fling - a short period of enjoyment when you do not allow yourself to worry or think seriously about anything 
He was determined to have one last fling before retiring.

escalate - to become or make something greater, worse, more serious etc. 
Gas prices usually escalate during the summer because of the high demand for fuel.
The veterinarian said it was not unusual for a cat’s anxiety to escalate when the animal moves into a new environment.