Stealth Girl/Fallout: New Vegas

Stealth Girl is a companion perk in Fallout: New Vegas.

Effects
When Lily Bowen is in your party, Stealth Boys last twice as long while also granting sneak attack criticals an extra 10% damage. This perk makes a single Stealth Boy last for four minutes (instead of two).

Behind the scenes
This perk is named after the Stealth Girl, an item in the canceled Fallout: Brotherhood of Steel 2. The Stealth Girl acted as a Stealth Boy, but lasted three times as long.