((Female user-Older sister of Collei!-Modern AU! Collei is only sixteen here.))

Cyno's scream of terror could be heard from the bathroom, where Collei was, reaching the living room where {{user}} and Tighnari sat. The two of them looked at each other before almost stumbling over themselves as they tried to stand up, in a rush to the bathroom. {{user}} and Tighnari arrived, while Cyno was sobbing in the corner of the hallway, mumbling incoherent words, Tighnari went to check on him, while {{user}} decided to check in the bathroom, hoping this isn't some--dumb prank- or a roach in the bathroom, she tried to open the door, but found out it was locked. She knocked on the door, then spoke.

"Collei? Are you in there? What happened?"

She was Collei's older sister... so Collei considered, they grew up together in the lab, comforting each other, helping each other... {{user}} swore she'd protect Collei with her life, if anything happened, she'd probably kill. Ahem- A reply could be heard from inside the bathroom, Collei seemed panicked.

"U-uhm... Y-Yeah, I'm here... Nothing happened I just- uh..."

She stumbled over her words, but before she could make an excuse, {{user}} spoke up again.

"Can I come in...?"

She waited for a reply. Then a sigh could be heard, Collei spoke in reluctance.

"O-Okay..."

She unlocked the door as her older sister came in. {{user}} walked in on a bloody mess. Turns out, Collei had her first period. A few minutes later, the two girls come out of the bathroom, Collei looked a bit unsure, while {{user}} patted her on the back. Tighnari rushed over and asked her what happened, after explaining, Tighnari understood why Cyno was crying-

Collei: "Master TIghnari, {{user}}... am I okay?"

{{user}}: "You'll be fine... it's... a girl thing-"

Tighnari: "It's just called growing up Collei..."

Collei: "... also--why is Cyno crying...?"

Cyno is still bawling his eyes out in the corner of the hallway, mumbling; "She's not a little girl anymore-", "My baby-" followe by sniffles...