Please, Stay- A Stydia AU

How to Live

"It'll be fun, Lydia!" Allison stretched across her bed and grinned at her. "Stiles will be there."
Lydia bit her lip, not wanting to admit that that did make it more appealing. "But a beach party? Could that be more cliche?"
Allison grinned and pushed herself up into a sitting position. "Come on Lydia. Admit it. It sounds fun. You, me, Scott, Stiles, Isaac, Kira... The whole crew."
"And half of the school." Lydia leaned back against the back of her chair. She hadn't been to a party of any type since they'd lost Turner.
"Lydia I'm not going to make you go," Allison said. "I just... I think that you need to..."
"Get away from my dad?"
"Learn to keep living," Allison said gently.
Lydia looked out the window at the treehouse between her bedroom and Stiles's. He was in there, printed out pictures in his mouth as he pinned them one at a time to the wall. As if he could feel her watching, he looked at her and gave a happy grin and a wave of his hand. The pictures spilled onto the floor and his limbs went every direction in a mad attempt to catch them before crouching to pick them up and throwing her an embarrassed grimace.
"Okay," she said slowly. "I'll go."

-~-~

"Ly-dia!" Stiles cheered as Lydia and Allison came towards them on the sand. Stiles bounded to them and skidded to a stop as he reached them. He threw Lydia a grin. "You wore heels to the beach."
"I can't believe she can walk in them."
"Relax. They're only three inches." Lydia grinned between them.
Stiles rolled his eyes. "Yes, because I wear three inches every day."
Lydia kicked them off by their now fallen beach bags and said without missing a beat, "I knew it."
Stiles grinned at her. "Do you know what I'm doing now?"
She eyed him distrustfully then gasped and tried to run but he caught her around the waist and lifts her up. Lydia squealed a laugh. "Stiles!"
He took off running for the water and raced into the waves then threw himself into the water with her.
Lydia surfaced, shaking with laughter. She grinned at him. "You pain in the ass!"
Stiles laughed and spread his arms. "Welcome to the beach party!"

-~-~

"I hate this song!" Lydia said, glancing at the place where everyone was gathered together dancing.
  "I'm calling your bluff on that." Stiles leaned back on his arms and grinned at her. "You like it."
"Oh really? How do you know?"
  "The back of your brother's picture. You wrote the lyrics." Stiles watched her and whispered under his breath, "It's been a long day... Without you my friend..."
  "And I'll tell you all about it when I see you again." Lydia looked at him and gave a small smile. "You win."
  "Nice try though. You also like Kesha. I hear it from your room."
  Lydia grinned. "You don't have to know everything."
  "That is not nearly as much fun."
Lydia laughed. Stiles smiled at her, watching her intently.
  Then something cut through them, through the music. A ringtone. Stiles grabbed his phone and answered. "Hello? Yes. I-It's me. I- Is it my- Shit." stiles was on his feet. "Is he okay?"
  Lydia slowly got up. "Stiles?"
  "Oh my gosh. I'll be right there." His eyes were wide, his breathing was picking up. "I- Give me just a few minutes. I will be right there. Please don't leave him Melissa. Please." Stiles pocketed his phone and then grabbed his shoes and then was tearing across the sand.
  "Stiles!" Lydia stared after him. She scrambled to her feet and raced after him. By the time she reached the parking lot, he was driving out of it.
  Anxiety pounded through her as she returned to the party. Her head was spinning. What had happened? Was he okay?
  She managed to find Allison, who was sitting on the sand by the water. "Do you know what happened to Stiles? Where's Scott?"
  Allison pointed. "On the phone." She bit her lip. "His mom called... It doesn't sound good."
  Scott slowly came back to them, his face pale. "It was my mom. Stiles's dad had a heart attack."