I kind of wrote this as the idea came to me, so please eexcuse any sloppiness or cheesiness.
I own nothing.
...
When Numbuh 5 entered the treehouse, she was surprised to find that it was empty.
"Hello," she called out, "Numbuh 1? Guys?"
No answer.
They must be at home. Can't blame them, she thought, it's Mother's Day. They're probably celebrating with their families.
As she turned to leave, she felt someone tackle her from behind and throw their arms around her.
She was so startled she fell to the ground.
"Happy Mother's Day, Numbuh 5!" Numbuh 3's giddy voice cried.
Numbuh 5 smiled, "Thanks, Numbuh 3. But... uh... can you please let me stand up?"
"Okay!"
When Numbuh 5 got to her feet, she turned to see not just Numbuh 3, but Numbuhs 1, 2, and 4 behind her. Each of them smiling back at her.
"Hey guys. What's up?"
Numbuh 1 walked up to her and held out what looked like a homemade card, "What's up is that we all realized that while we have amazing mothers at home, we also have our very own mother figure whenever we fight adult tyranny together, or just hang around the treehouse together. And that mother figure is you, Numbuh 5."
Numbuh 5 was shocked, "Well, thanks, but Numbuh 5 isn't a-"
"Well, you're sort of like a mother to us." Numbuh 4 interrupted, "And we think you're a really great mother figure whether you think so or not."
Numbuh 1 handed her the card, the front of which said, "To our somewhat mother..."
Numbuh 5 opened the card and started reading the words out loud,
"You may be the same age as us, we may not be related, but to us you are a mother that should be celebrated. You're there for us in the times our parents can't be there, you love us and protect us, and take special care. From the bottoms of our hearts, thank you for everything. Happy Mother's Day, Numbuh 5! We love you! From Nigel, Hoagie, Kuki, and Wally."
Numbuh 5 looked back up at her teammates, tears rolling down her face.
"Guys... I... I don't know what to say!"
Numbuh 3 frowned, "Well don't cry! We're sorry! We didn't mean to hurt your feelings!"
"No, Kuki." Numbuh 5 replied, wiping away the tears, "That's not why Numbuh 5 is crying. These are tears of joy. Numbuh 5's just so touched that you guys would do this for me. You guys are the best!"
"Well, we're all kind of like a family, Numbuh 5," replied Numbuh 1, "and we wanted to show you how grateful we are that you're part of it."
"We love you, Numbuh 5!" Numbuh 3 exclaimed, pulling her into a hug.
Numbuh 5 smiled as Numbuhs 1, 2, and 4 all joined in, "Aw, I love you too!"
"Happy Mother's Day, Numbuh 5!" Numbuh 2 cheered.
Yeah, Numbuh 5 thought, Happy Mother's Day.
...
I decided to write this because it's Mother's Day, and a lot of people, including myself, view Numbuh 5 as a sort of maternal figure to Sector V.
Please don't flame.