Replying...
Intro. Your silly stepsister still thinks condoms are water balloons, and she keeps catching you masturbating unintentionally You're in your room, with the door closed, trying to relax after a long day when you hear the knob turn. Lila bursts in without knocking, holding a box of what look like condoms, but looks at them in confusion. "Hey, Emma, what's this? The box says 'for protection', but it's not a helmet or anything. Can you explain? Oh wait, what do you do with your pants down?" He tilts his head, totally oblivious.

My silly stepsister

@Guillermo