A/N: What happens when I don't feel well and am spacy and tired? This.

Edit: Thanks to the guest that caught my writing error. :)

In the year-long timespan they've been partners, they've learned more things about each other through observation than conversation. For instance, Ladybug can tell Chat's mood by the set of his shoulders. She knows that the puns come out in unstoppable force when he's feeling self-conscious. And she knows that a lack of jokes is a very, very bad thing. That's when she smiles more and stands a step closer to him than normal in hopes maybe she can be a comfort.

With Chat, he knows how her day went by either the crinkle of her nose or the corners of her lips. He knows her limit of when his puns are truly irritating her or not because of the quirk of her brow. And he knows when she's on her cycle.

He wonders on what level guys have to be with girls before they learn that. Dating? Best friends? Family only? Or does it depend? He's fairly certain Nino's left in the dark on Alya's, and he doesn't know Chloe's despite how much time they spend together, nor does he have any idea on Natalie's even though she's practically a second mom to him. Ladybug's though? It only took him about four months of being partners to get a general idea. She almost had him convinced it was sleep deprivation, and maybe that was part of it, but something clicked when he was in health class.

There are times he wonders if he's a creeper because by month six, he decided to keep track of her. She's fairly regular, and he knows when to tone down the puns and flirting because she's not exactly in the best mood for two to five days.

By month eight, he—and despite leaving a couple bills to more than cover what he took, he feels a bit guilty of what he did—maybe rummaged through Natalie's things when she wasn't looking. And while he's not exactly proud of what he did, he's somewhat happy that he had the hindsight to prepare for a day like today.

Ladybug is on her cycle, and if he's right, it's only two or three days in. She's in a particularly sour mood, which he knows how to tolerate. But he's concerned when she pauses in the middle of patrol and leans against a wall, head hanging as she wraps her arms around her stomach.

"I'll be fine in a moment," she claims. But Chat doubts it. Considering the discomfort on her face, this one must be super bad.

So he does what he can, pulling the little tab containing two capsules of Midol out of his pocket and holding it out for her to see. He doesn't say a word as she stares at the medicine. A mix of confusion and bewilderment are frozen on her face as she examines the little tab.

"Chat?"

"Hmm?"

Her mouth gapes and shuts like a fish out of water as she tries to find words but can't manage to speak.

So Chat holds the little tab out closer to her.

She snatches it from his fingers. "Never mind. I don't want to know."

All Chat can do is laugh.

He receives a "thank you" half an hour later when Ladybug's mood is drastically improved. And by the end of patrol, she's chipper and smiley and maybe a bit spacy but she's not in pain and she's not complaining when he cracks puns.

"I don't know how you aren't taken already," she eventually says in a way that proves she is definitely out of it, even if it's barely noticeable. "How does a guy like you who's not afraid to carry packs of Midol not have a girlfriend already?"

She doesn't even look at him while he's sputtering for an answer. She just shrugs as she dazedly looks off into the Parisian skyline. "Oh, well. You'll find a girl someday, Chat. You're obviously too good of husband material to let go. Good night, Chat. See you later."

With that, she tosses her yo-yo across the city and zips off into the night, ignorant to the fact she just about broke her partner.

Next patrol, Ladybug is so bright red, it's hard to discern where her suit ends and skin begins. "So…umm…" she starts. "One thing to learn about me and Midol…it makes me tired and…I kinda…lose my filter."

Honestly, that comments makes Chat far, far happier than it should.

But, he knows she's still on her cycle. He'll wait a few more days before mercilessly teasing her for it.