You had recently bought a new lipstick. More specifically, a colour changing one.

"I don't get it.. there's nothing on your lips."

Kai mumbled in confusion, staring at your lips after you applied it.

"And the lipstick itself is literally see through.. whatever." He grumbled, turning on his phone.

A few minutes later, he looked back at you, seeing that your lips are now red.

"Wait- huh? How?! What kind of black magic lipstick did you buy??"