Acting as a catalyst and transported by an accidental arcane apparatus, Syn'Thea the Succubus Queen arrives through an unstable atomic fissure on a future Earth.  The wild quantum anomaly deposits Syn'Thea in the uninhabitable reaches of the Glowing Sea.  Immune to the high levels of radiation that saturates that region, Syn'Thea spends a little over a week exploring and slaying the mutations that arouses her wrath.   Stumbling across Vault 117 and discovering it still-intact computers,  She is able to activate and exploit its database via electrokinesis.  Finding the lawless and near-anarchic conditions of the Commonwealth to her liking, she reaches and seduces the Gunners stationed at Vault 95.  She is quick to enthrall them only to feeds on their flesh and souls to sate a ravishing apatite.  She keeps some gunners to maintain the post and enslaved any security droid and war-bots to do her bidding

 

The years is 2287 and 8 months after the Lone Survivor was released from cryogenic suspension.  After her first feeding, the next question on her mind is..,

 

What does a Demon Queen do for fun around here?