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If you sided with the Thief faction upon entering the sewers for the first time, you should head down to Juanita Suarez in the Thieves Congregation level. She's the guildmaster of the Thief faction, and she'll ask you to perform the following quests:

1. Recover Juanita's Locket - You'll find the wererat with the locket on the Hall of Beggars level of the sewers. Once you kill the wererat, just grab the locket and return it to Juanita (200 experience).

2. Kill Enrique, the Leader of the Beggars - Enrique is also on the Hall of Beggars level, but he's much more difficult to kill than the other wererats in the area. Once you kill him, return to Juanita (500 experience).

3. Rob a House - The house is next to the cathedral in the Temple District, and Juanita will even give you a key. Inside the house you'll find gold in the shelves and in a hidden cache. When you return to Juanita (500 experience), you'll have to share a cut of the profits, or else you won't receive any more quests.

4. Collect Dues - You'll find the guy who owes money in the Port District. He'll give you 125 gold as soon as you enter his house. When you return to Juanita, she'll take her cut again, but this time she'll also give you Bracers of Stealthy Cunning (+20 sneak, +5 speech).

By completing all of the Thief faction quests, you'll receive the Thief Comrade title perk. Juanita will also suggest you spend the night together, but if you do she'll rob you of 500 gold. However, she'll open the secret door to her bedroom, and inside you can find a treasure chest that will probably give you an item worth more than 500 gold.