Have you ever heard the old adage "love is blind." Well true as that my be, it would also be accurate to say something like "love is wide-eyed."
It turns out that your eyes physically react when they see someone that you love or are attracted to. Your pupils dilate when there is less light - to let in more light so that you can see.
Dilated pupils are seen as more attractive. So either your eyes are subconsciously trying to make you more attractive to that person you love or they are dilating simply to be able to take that person in more clearly. What came first, the dilated pupils or the attraction?
http://www.sosuave.com/articles/lookinto.htm

Na lie

None! I was tinkn towards the direction of adrenaline. The excitement probably causes an adrenaline rush which dilates the pupil. Dats wat i tink

Even an s. s. 1 student of backyard group of schools should know this it's simple biology and by the way the same thing happens when you also see someone you hate.

And moreover there is nothing like pupil expanding, your pupil either dailate or it constrict.

And moreover there is nothing like pupil expanding, your pupil either dailate or constrict.

This is me looking at Okija Juju . Silly topic!