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The following day, Callie and Arizona were getting back from picking Sofia up from summer camp—the latter jabbering about the potluck foods the whole way home—when they looked down the hall and saw something they weren't expecting.

Callie's mouth fell open. "Daddy?"

Arizona's head shot up. "Carlos."

"Grandpa!" Sofia exclaimed, running toward him for a big bear hug.

Carlos laughed as he squeezed his granddaughter tight. "Hi, mija. It's been a while!"

"I missed you!"

"Dad, what are you doing here?" Callie asked, unable to mask her distaste. She was planning to have her tenth date with Arizona that night—not a family reunion.

"Don't worry, Calliope," Carlos chastised. "I'm here for work for the weekend and thought I might stop by since I was close by." He looked up at Arizona. "Nice to see you."

"Yeah," Arizona gulped. "You, too."

"Well, I don't want to impose," Carlos began, "but I'd love to take us all out for dinner tonight."

Callie made a face as she opened the apartment door and they all shuffled inside. "Tonight's not the best night..." Her phone began to ring, and she excused herself to take the call.

Regaining her composure, Arizona offered, "Can I get you something to drink?"

"We have water, and milk, and wine," Sofia chimed in, grabbing her grandfather's hand and holding it in hers.

"Sof," Callie began with a sigh as she walked back into the room, "your counselor called. You forgot our cookie dish at camp."

"Oh, yeah," Sofia realized.

"We need to go get it before they go home," Callie told her, grabbing her keys. "Go get your coat, okay?"

"Do we really need to get it back?" Arizona asked, not wanting to be left alone with her father-in-law. "I mean, it's just a platter, right?"

Callie pursed her lips. "We got it as a wedding gift."

"Oh," Arizona breathed, remembering the platter Richard Webber had given them. She was touched that Callie had held onto it for all these years—that she'd brought it all the way to New York with her.

"Daddy, can we do something tomorrow, instead? Sofia and I need to go grab the dish."

"I can stay here and catch up with Arizona while you're gone," Carlos suggested.

Callie started to say something, a little nervous about her father interrogating Arizona or something, but Arizona stopped her, offering a reassuring smile. "We'll be fine, Callie. You two go. Your dad and I can catch up a little in the meantime."

Callie carefully inspected her face, nervous on Arizona's behalf. Finally, she accepted, "Okay."

She kissed Carlos on the cheek, Arizona on the lips, and said "Come on, Sofia," as she opened the front door.

Sofia skipped after her, and then it was just Carlos and Arizona, alone.

"So," Arizona hemmed. "Long time…no see."

Carlos nodded—stiff as he always seemed to be. "Calliope says you two are back together."

"We are," Arizona confirmed, handing him a glass of water. "And I know you and I haven't always been huge fans of each other..."

"We've both done things we regret," Carlos agreed. "But we both love Calliope and want the best for her."

Arizona nodded in assent. Of course it was true.

Carlos gave her a long look, then decided, "You're what's best for her."

Arizona's eyebrows flew up in surprise.

"She's giddy over you," Carlos explained. "Every time I've called her in the past few weeks, I've heard the smile in her voice."

Arizona dimpled. "She's the most amazing person I've ever known," she admitted.

Carlos's lips quirked up, knowing that Arizona was telling the truth, that no one in the world truly loved Callie just as much as he did—maybe more. "And you're back together? Officially?"

"Well, we haven't..." Arizona shook her head, realizing she was about to give her father-in-law waaay too much information.

"Haven't what?" Carlos pressed, his face demanding an explanation.

Arizona let out an embarrassed laugh. "We haven't, um, consummated the relationship…yet."

"Seems unlike you two."

Arizona blushed. "We just wanted to, you know, reconnect on other levels first—to move slow, for once—so we came up with this ten dates idea, and-"

"When's the tenth date?"

Arizona gave him a guilty smile. "It was supposed to be tonight."

Carlos looked at her for a long moment. "Hmm."

An hour later, Callie and Sofia returned with the dish.

"Hey," Callie breathed as she walked in, unable to keep from lighting up when she met Arizona's eyes. She walked up to her, whispering, "Everything okay between you two?"

Arizona offered a reassuring smile, vowing, "We're good. I think he actually likes me."

Callie nodded thoughtfully, noticing her dad was watching them with a wistful smile. "I think he does, too."

Carlos turned to Sofia. "All right, mi amor, what do you think of having a grandfather-granddaughter date tonight? We'll go get dinner and ice cream, and then we can have a sleepover at my hotel. There's a jacuzzi in my suite!"

Sofia's jaw dropped. "Really?!" She turned to her moms. "Can I?"

Arizona looked over her at Carlos. He had a twinkle in his eye. She never would've guessed that he, of all people, would become her wingman. "Of course!" she exclaimed. She turned to Callie. "Right?"

Callie immediately nodded, realizing that this meant their nighttime plans were back on. "Go get your pajamas and toothbrush, Sof!"

To her dad, she asked, "You're okay with waiting until tomorrow night for us all to go out for dinner?"

"Of course, mija," Carlos assured her.

"I'm ready!" Sofia announced a minute later, lugging her backpack behind her.

"Let me just say bye to your moms, and we'll go." He pulled Arizona in for a hug and kissed her cheek. When he pulled away, he said, "Take care of my daughter."

"I will," Arizona promised.

He then hugged Callie tight then pulled back, looking his daughter in the eyes as he gestured toward Arizona. "You do the same."

Callie reached for Arizona's hand. "Always."

"Bye, Mom! Bye, Mama!" Sof yelled from the doorway, eager to spend time with her grandpa. "I'll see you tomorrow!"

"Have fun!" Callie and Arizona called after them as Carlos and Sofia headed down the hall, hand-in-hand.

As soon as the front door was shut, Callie looked at Arizona. "Is it just me, or did he seem to know that we're going to have sex tonight?"

Arizona hesitated. "I might have accidentally, maybe...told him?"

"What?" Callie squawked.

"It just happened!" Arizona defended in a laugh.

"Oh, my god," Callie threw her hand over her face. "I'm never going to be able to look him in the eye again."

"It's okay," Arizona soothed, running her hand over Callie's shoulder. Then, realizing something, her hand suddenly stilled. "Not that we have to do anything tonight, if you don't want to."

Callie looked at her in disbelief. "There's no way I'll survive waiting another day."

Arizona smiled. "Me neither." She cupped Callie's cheek. "How about I order some pizza?"

Callie chuckled. "Let's do it. It's a tradition now."

While Arizona called to order the pizza, Callie settled on the couch, her stomach suddenly filled with butterflies. Tonight was the night. They'd finally made it.

After ordering, Arizona plopped down beside her, saying, "Pizza will be here in thirty."

Callie cracked open another beer and handed it to her. "To our last first time."

Arizona clinked Callie's bottle with a smile. "Cheers."