Excerpt from The Last Boy and Girl in the World by Siobhan Vivian, plus links to reviews, author biography & more

I crawled over to her on my knees and put my head in her lap. Sweetly, I said, "Hopefully he'll die soon, and then you'll never have to worry about seeing him at all! You should try praying for that the next time you go to church."

Morgan gasped and pushed me on the shoulders, sending me backward onto the carpet. "Oh my God, Keeley! That's so wrong! How could you even say that?" But she was laughing, because she knew I was joking. I was always saying crazy stuff like that, taking it too far. Too far was my default setting.

I flailed my arms and legs like a turtle stuck on her back. "Because that's what best friends are for!"

Morgan wore the tiniest hint of a smile as she reached to pull me up. "I'll text Elise and tell her we'll be over soon."

While she did, I pulled a peach sock with lavender stripes from her laundry basket but couldn't find its match. I went over to her dresser and opened the top drawer.

I had to dig a little to find it. It was underneath a plush stuffed chick with his wings glued around a plastic egg. There'd been a chocolate heart inside that egg. Morgan had given me half on our drive home from hanging out with Wes during Easter weekend. It was milk chocolate with Rice Krispies, my favorite. We ate the chocolate and drove home with the chick propped up on her dashboard, its googly eyes googling with every bump in the road.

Wes gave Morgan tons of little presents like that all the time—cheesy greeting cards, silk roses, key chains, perfume, candy. Elise said that showed what good boyfriend material he was, though I doubt he paid for any of it since his parents owned a drugstore. Before their breakup, Morgan prominently displayed the gifts around her room. When they disappeared, I assumed she'd thrown them away. But they were all there, crammed in the drawer. I lingered over them until Morgan chucked her phone aside. Then I quickly pushed the drawer shut.

"Don't you think this is a huge overreaction?" Morgan said, half underneath her bed, reaching for her galoshes. I wasn't sure if she knew what I'd seen or not. I certainly wasn't going to say anything about it. "I mean . . . I get that it's supposed to be a crazy storm, but Levi asking Key Club to come out on a Sunday morning to stack sandbags seems crazy."

I'd had the same thought myself. The river flooded at least a few times each spring, and even with the rain that had already fallen, it hadn't added up to anything disastrous. The people in town who lived closest to it knew to take certain precautions when it was supposed to storm, like parking their cars on higher ground and moving their patio furniture indoors. It was more annoying than dangerous.

"Yup," I said. "And also, Levi didn't ask. He basically demanded. I would have told him to screw off if I wasn't sure he'd kick me out for insubordination or whatever."

Our high school didn't have a ton of clubs, and so I needed to list Key Club on my college apps. I was even considering running for president next year, because my guidance counselor said admissions tended to favor candidates who held leadership positions over kids who just listed a bunch of activities.

"I wouldn't put it past him," Morgan said, her lip curling. "He's the total worst."

"Well, I'm choosing to think of it this way. If the river does flood, we'll have done our part to protect our soon-to-be-inherited beachfront property."

Morgan grinned at that, spinning around to face me. "Thirty-two more days until we're officially seniors."

"Thirty-two more days," I echoed, just as excited. At that moment, Wes was the only obstacle I saw between me and Morgan having another terrific summer together. And whether or not she kept his crappy trinkets hidden away in her drawer, he was still, thankfully, her ex.

Excerpted from The Last Boy and Girl in the World by Siobhan Vivian. Copyright © 2016 by Siobhan Vivian. Excerpted by permission of Simon & Schuster Books for Young Readers. All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.