Disclaimer-I don't own this awesome show!

This is my first Hawaii Five-0 fic. I have plans for this to be around 10-15 chapters. I hope you enjoy it!

Steve sat with Serenity and Willow on either side of him in a waiting room again. That was the third time today, the first being at Dr. Harrison's office, then Dr. King's office, and now to get blood tests.

A nurse came into the waiting room. She smiled and said, "You can come back here."

Serenity and Willow both stood up, relieved the nurse didn't say Steve couldn't come with them. Steve stood up as well.

"Steve?" the nurse asked.

"Lauren?"

"I haven't seen you for so long! I hear the reason Catherine was so excited when she left my birthday party was she was going to see you."

Steve smiled. "If she heard you right now, she'd-"

"Flip you upside down! You can't keep a secret, Lauren!"

Catherine stepped into the waiting room.

"Catherine?" Steve asked.

"Apparently, it's Bring-Your-Daughter-to-Work Day, but Lauren told me it was Bring-Your-Sister-to-Work-Day," Catherine explained.

Lauren laughed. "I don't have a daughter and I didn't want to be lonely, so I tricked my ever-so-gullible little sister into coming with me."

Catherine noticed Steve trying not to laugh. "Shut it, Steve!" She turned her attention to Willow and Serenity and smiled. "I didn't realize I'd get to see you two early! How'd it go this morning?"

Willow sighed guiltily. "I was bad."

Catherine looked shocked. "You couldn't have been bad, Willow."

"I didn't mean to be. Steve had to tell me to stop 'cause I yelled at Dr. King."

With confusion, Catherine asked, "Dr. King? I thought you were going to see Dr. Harrison."

"We did, and then we went to a pediatrician," Steve said.

"I had to get three shots," Willow said sadly.

"Oh, no!" Catherine gasped, crouching down in front of the little girl.

"But it's okay. Steve held my hand the whole time," Willow explained.

"Aw, Steve's so nice, isn't he?" Catherine asked, glancing at Steve to find him uncomfortably standing there.

Willow nodded. "Yeah, I don't know why everyone thinks he's so tough, 'cause he was really nice to me and Serenity today."

Catherine laughed. "Steve's a big softie."

Steve glared at her. "I didn't think I came here to be insulted."

"That's right. Unfortunately, we have blood tests to do," Lauren said.

"Serenity can go first," Willow quickly declared.

Serenity sighed. "Fine."

"You and Steve can come back here," Lauren said, bringing them to a small room. "You can sit right here, Serenity."

Serenity sat down, laying her arm on the special arm rest for drawing blood. With her other hand, she held Steve's hand.

"This band is going to wrap around your arm, just above your elbow. It's going to help me find a vein. You'll feel it hug your arm, but it won't hurt you. Are you ready?" Lauren asked.

Serenity nodded, and soon felt a squeeze on her arm where the tourniquet wrapped around it. She looked at Lauren who was preparing a needle.

"We need four tubes of blood. All you'll feel is a little pinch when the needle touches you. If you don't like the sight of blood, you probably shouldn't look," Lauren warned.

Serenity shut her eyes quickly and squeezed Steve's hand. She felt the needle pierce her skin and relaxed her arm as much as possible.

"We're almost done here," Lauren announced. "There we go, that's four tubes. Good job, Serenity."

Lauren put a folded piece of gauze over the spot where she removed the needle from. Then she put a clear piece of medical tape over it. "You're all done."

Serenity opened her eyes and stood up. Lauren led her and Steve back out to the waiting room where Willow was telling Catherine everything that happened earlier that day.

When Willow realized it was her turn, she attempted to protest. "Not another needle, please!"

It took a few moments, but Steve was able to get Willow to go to the small room.

"How about you sit with Steve, Willow? Will you feel better?" Lauren asked, getting everything ready.

Willow nodded.

Steve sat down and lifted Willow onto his lap. She wanted to tell him, "Daddy, I'm scared," but she had no idea if he wanted to be called "Daddy" or not.

When Lauren said it was time to start, Willow whimpered.

"Daddy, I'm scared," she said. Willow didn't realize until after she said it that she had in fact called Steve "Daddy."

Steve didn't know if he had actually heard what he thought he heard. Did the little seven-year-old sitting in his lap really just call him "Daddy?" She must have because Lauren beamed at him.

"I'm sorry, it just came out!" Willow exclaimed.

"No, don't be sorry, Willow," Steve said. Then he smiled. "You can call me Daddy whenever you want."

Willow leaned her head back against Steve's chest. "I'm scared, Daddy."

"I know, honey, but it won't take long."

Willow flinched when she felt the needle go into her arm. That was four needles in one day.

"It's over, Willow," she heard Steve say.

Catherine had gone home with Steve and the girls. She noticed that Steve was smiling the whole drive home.

"Why are you so happy?" she asked. "You had to see my sister today."

He laughed. "Are you still mad at her?"

"She wasn't supposed to tell you I was excited to come see you! But really, you came out with Willow and you both were happy. What's so happy about a needle?"

"He's happy 'cause I called him Daddy," Willow explained.

Catherine grinned. "Yeah, Steve's a good Daddy."

"Yup!" Willow exclaimed.

Steve pulled into the driveway, shaking his head. "Why do you guys talk about me like I'm a softie?"

"Because you are," Catherine said. "You're a SEAL on the outside, but you're a softie on the inside."

Thank you for reading and please review!