Books that make me swoon

So ever since that Top 10 Tuesday a while ago about books that make you swoon, I’ve been thinking off and on about what I consider the swooniest books. To be honest, the amount of swoon in a book is usually directly proportional to how much I enjoy it, but sometimes a book just needs one scene (or even one line) of swoony perfection--not even necessarily between the main characters--to make me adore it. I’ve divided my lists into YA and non-YA, but really, some of the books could’ve gone in either category, and the books aren't listed in any particular order.

YA
-Quintana of Charyn, by Melina Marchetta. Because Lucian and Phaedra. Finally.
-Jellicoe Road, by Melina Marchetta. Because not every first time is perfect.
-Anna and the French Kiss, by Stephanie Perkins. Because who knew the awkwardness of sharing a bed could be so romantic?
-The Scorpio Races, by Maggie Stiefvater. Because Sean freakin’ Kendrick.
-Graffiti Moon, by Cath Crowley. Because she breaks his nose on their first date.
-A Countess Below Stairs, by Eva Ibbotson. Because Tom's proposal is so dang wonderful.
-The Hero and the Crown, by Robin McKinley. Because sometimes I can’t get the image out of my head of Luthe listening to the ground as Aerin rides away.
-The Blue Sword, by Robin McKinley. Because it isn’t very comfortable for two people to hug when both are wearing leather armor, but they do it anyway.
-The Sky is Everywhere, by Jandy Nelson. Because sometimes the dorkiest and sexiest moments of your life are the same moment.
-Fangirl, by Rainbow Rowell. Because not only “Are you rooting for me?” but also because Simon and Baz.

Non-YA
-Mystic and Rider, by Sharon Shinn. Because she kisses him. Both times.
-The Winter Sea, by Susanna Kearsley. Because the ending literally made me squeal.
-The Guernsey Literary and Potato Peel Pie Society, by Mary Ann Shaffer and Annie Barrows. Because they could’ve gone on longing for one another and pretending not to notice forever, but they don’t.
-The Chocolate Kiss, by Laura Florand. Because she can trust him with her.
-The Chocolate Touch, by Laura Florand. Because he wants to spend four years proving himself to her.
-Unlocked, by Courtney Milan. Because he doesn’t just say he’s changed, he proves it over and over.
-The Peach Keeper, by Sarah Addison Allen. Because Pax and Sebastian. Obviously.
-The Piper's Son, by Melina Marchetta. Because chapter 29.
-Spindle’s End, by Robin McKinley. Because Narl never used to whistle.
-Silent on the Moor, by Deanna Raybourn. Because Brisbane makes you work for that ending.

So what do you think? What about a book makes you swoon? Which books would be on your list?