What does the stealth ability do? It just says that you can secretly use the computer in the morning without mom noticing. But I have no idea what that means, because I can use the computer in my room at any time.
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Some sexual scenes and interactions can only be done with higher stealth. If your stealth is low and you want to see scenes that require stealth you have to level it up. There are a few awesome scenes and sexual interactions you probably missed and are going to miss in later patches due to low stealth. Keep licking Dana's breast during the night when she is asleep to max it.