Sierra Petrovita

Sierra Petrovita is a Nuka-Cola addict living in Girdershade. Sierra is blissfully and innocently unaware of her neighbor Ronald Laren's obsession with her or his unsavory intentions with her.

She has her own Nuka-Cola "museum," (really just a display of her collection within her shack) which she gives tours in. After completing the tour she will give you an Ice Cold Nuka-Cola. Going through the challenge initiates The Nuka-Cola Challenge quest in which the Lone Wanderer must gather 30 Nuka-Cola Quantums 40 Bottle caps per bottle. Completing the quest her way grants the player good karma.

Should you instead help Ronald Laren in his quest to sleep with Sierra by giving him the Quantums (which he then gives to Sierra), she completely misunderstands his subsequent sexual innuendo and believes he intends to propose marriage to her. The player will receive 40 Bottle caps (but, if you succeed in a speech check you can get 80 Bottle caps) as well as bad karma.

Unmarked quest: Mississippi Quantum Pie
After completing her mission to obtain a large supply of Nuka-Cola Quantum, if you bring her 1 Nuka-Cola Quantum, 1 bag of Flour and 1 bottle of Vodka, she can make you a Mississippi Quantum Pie.

Trivia
Just as Nuka-Cola is an obvious parody of Coca-Cola, Sierra is a parody of people who collect Coke memorabilia, in particular the distinctive glass bottles used by the company during the first half of the 20th Century.

There are 54 Nuka-Colas in Sierra Petrovita's House, 55 if you include the ice-cold Nuka Cola she gives you upon the conclusion of her tour.

Related Quests

 * The Nuka-Cola Challenge
 * Mississippi Quantum Pie (quest)

Bugs

 * Sometimes when you walk into her house, a Yao Guai will randomly have spawned and kill her unless you act fast. Further study suggest that more than just Yoa Guai spawn. I've encountered Mole Rats, 4 Sentry Bots at the same time, a Deathclaw and a Glowing one. Provide that you attack the creatures or machines as soon as you get in the shack, Sierra will flee her house, and stay in close proximity to Girdershade.
 * If you kill Sierra, even after severing her head from her body, she may still complain when you steal stuff from her house.
 * sometimes, if you have Fawkes as a follower, upon entering the house, Fawkes will attack her. She usually gets killed by Fawkes, but sometimes manages to flee the house. Sometimes this will happen even if Fawkes does not attack her. on my Xbox version Fawkes will attack or make flee any female character who will trade or has a repeatable quest on them.(e.g Moira Brown, scavengers)

please extend this if anything experienced on any other console/PC