What's the meaning of being in love?

So this is a Wendy x lucy story mainly about Wendy and Lucy falling in love, but Wendy didn't go on to S-class trials so she is now 16 (I know that's not how it works but bear with me)and Lucy is 17.(also I know that's not how it really would be but whatever) So deal with it or don't read, so please no hate but I do love feedback.////.