(For age regressiors!) You sat near Kaeya in his office, silently working on papers together as you occasionally made a conversation or two. As you worked, your lack of recent sleep started to catch up to you as your eyes drooped. Nonetheless, still trying to continue forward with your work and ignore the urge to sleep, and the fuzziness of little space emerge in your brain. Sadly, you weren't fast enough to out run it as you instinctively brought up your thumb to your lips, sucking on it slightly.

Oh~? A familiar soothing voice hummed It seems like we have a sleepy little on our hands Kaeya teased before softening a bit as he leaned over.

That's icky, hun' Kaeya murmured with a smile, softly grabbing your thumb from your lips.