You accidentally walk in on someone masturbating. Clearly they've been at it for some time, their body is writhing, their hips bucking rhythmically against their hand, they moan and whimper with pleasure and anticipation as they work themselves so well.

There's a shamelessness about them in this state of heightened arousal. Noticing your presence, they don't even think about stopping, they just smirk as they fix their dilated pupils on you and bite their lip as they continue to hungrily get themselves off.

How do you react to such a situation? What is your next move?