A/N I haven't written for CS before but I wanted to try a little something just before season 4b comes out. This idea came to me in a dream but I hope it's enjoyable?
Emma has learnt to read people so well it is second nature; they don't get the chance to hurt her if she doesn't let them in. The first time she meets Hook, she can see the darkness hiding underneath the veneer of helplessness. Climbing the beanstalk gives her too much of an opportunity to read him and for Killian to read her. Broken glass shards of the truest blue cut too sharply for her and she cannot stick around for him to hurt her (the daggers in his eyes when she left him chained used to haunt her dreams. No-one had ever seen through her so quickly. Promises herself it doesn't matter anyway. She lies.)
Killian has had over 300 years of experience with people and they very rarely manage to surprise him. He will never put himself and those he loves in the position of weakness ever again; it hurts too much when they are ripped away. The woman with the brightest green eyes who sees through him immediately, is however much too interesting for him. He can read the fractures where someone shattered her stained glass soul (he wonders whether, after she has left him, she will let anyone fix her. Promises himself he doesn't care anyway. He lies.)
Both of them can see that the glass shards fit together. It takes a while. Her emerald eyes are only used to looking for danger and the promise of heartbreak, the fear of betrayal might not ever leave (but she hopes someday that it will). His azure eyes reveal too much of himself and he is aware it scares her but he will not lie to her, never has and never will (being an open book is both a curse and a blessing in their case).
Eventually the tides of time work their magic, the shared adventures break the walls and smooth the rough edges left by others. Their souls' glass windows are the aqua of the deep sea; the truest mixture of her bottle green and his cobalt blue. It requires patience and bravery to keep the tumultuous sea in their favour but together they will sail the world, even from their bed in a small apartment in a town called Storybrook.