Morrowind:Ahnassi, a Special Friend

Quick Walkthrough
#Meet Ahnassi in the Halfway Tavern in Pelagiad and let her admire your smooth moves.
# Give Ahnassi the gift of friendship by acting on her tip about a special belt.
#Share a care with Ahnassi to learn that a Camonna Tong thug, Daren Adryn, has frightened her.
#Travel to Gnaar Mok and take care of him, which ever way you choose.
#Return to have Ahnassi clear your criminal record.
#Hear about a key to the Redoran Treasury in Vivec and plunder the vaults.
#Ahnassi's old friend has turned to Skooma; convince him to let go of that habit.
#(Optional) Visit Ahnassi's friend, the Acrobatics Master trainer Senyndie, for better prices and a skill book.
#Bring Ahnassi two flowers, a Coda Flower and a Gold Kanet, as a token of your love.
#Steal a Flamemirror Robe from a Telvanni wizard in return for 20 ebony throwing stars.
#Pick up the Elvul's Black Blindfold (a glove actually) from the Imperial Commission inside Castle Ebonheart.

Detailed Walkthrough
Ahnassi, a Special Friend
If you are a male character, visit the Khajiit Ahnassi in the Halfway Tavern in Pelagiad. Raise her disposition to 50 and she'll open up to you. Choose the smooth moves and her profession dialogue topics and then Give Ahnassi the gift of friendship. She'll then plead with you to come and visit her often, which opens up a string of quests with her.

A New Belt
Once you and Ahnassi are properly acquainted, she'll reveal to you that the guest Hrordis, upstairs, has a magic belt and worships Mehrunes Dagon. The belt is actually the Belt of Sanguine Fleetness which is needed for the involved Threads of the Webspinner quest of the Morag Tong, so hang on to it if you decide to whack Hrordis. However, Hrordis won't talk to you, so either have a crime rating already, or go without clothes so you will be able to taunt her, or use Frenzy Humanoid (and let her or her summon strike first), among other tactics; see her article for numerous strategies to avoid a tavern-wide brawl and a murder bounty.

If you speak to Ahnassi about the new friend topic, you'll open up the share a gift option which will allow her to give you a quality potion of feather.

Pressure from the Camonna Tong
Share a care with Ahnassi to learn that a Camonna Tong thug, Daren Adryn, has frightened her by trying to force her to join the guild (which doesn't sound right, since the Camonna Tong doesn't like outlanders or non-Dunmer at all!). Someone bothering your girlfriend just won't do, so go and pay Daren a surprise visit in Nadene Rotheran's shack in the town of Gnaar Mok. You can talk to him about Ahnassi, but it will only serve to delay the inevitable fight with him and, unfortunately, the other three Camonna Tong members in the shack. The other three NPCs in the shack can be spared by exiting the building immediately after killing Daren Adryn, casting a Chameleon spell on yourself, then entering the shack again and casting a Calm Humanoid spell on the three NPCs before looting Daren's corpse (looting a corpse while in combat can cause the game to crash).

Return to Ahnassi, who will be so pleased that she will clear your entire current criminal record. She will also give you some new gifts including an extravagant shirt and pants and the Short Blade skill book The 36 Lessons of Vivec, Sermon 30.

The Redoran Vaults
Once you've taken care of Daren, Ahnassi will tell you that the Redoran noble Beldrose Dralor has a key to two small chests in the Redoran Treasury in Vivec, in his wife's chest of clothes. The Dralor Manor is located in the Redoran Plaza in Vivec and the key can be found in an unlocked chest of drawers in the top bedroom. It's better than she says, and leads to one of the greatest loot hauls in the entire game: the key actually unlocks the entire Lower Vault of the Redoran Treasury (and two chests within it, which are only a small bit of the booty to be found here). Just watch out for the guards who will attack if they see you take anything (the key words here being "see you"). See Vivec Redoran &sect;&thinsp;Robbing the Redoran Treasury for details.

The Third Wheel
If you explore her share a care dialogue topic, it turns out that your girlfriend has a former mate, J'Dhannar, about whom she still cares, and who is in some trouble. J'Dhannar is a Skooma addict who lives in the St. Olms canton in Vivec, and Ahnassi wants you to try to persuade him to quit the drug, though common wisdom about Skooma is "once an addict, always an addict". You'll find him on the lower level of the Canalworks section of St. Olms. He will become quite irate when you try and get him off the Skooma.  He'll also insist that he and Ahnassi are not former mates, but current ones. 

If you speak with a Savant (such as Ladia Flarugrius upstairs in the Halfway Tavern in Pelagiad where Ahnassi is, or Crazy-Legs Arantamo in Vivec's Foreign Quarter) about Skooma addiction, the book Confessions of a Skooma-Eater will be recommended.  Valued at 25 gold, it can be had at Jobasha's Rare Books (as one would probably expect) in Vivec's Foreign Quarter, and at the shop of Codus Callonus in Ald'ruhn, among other places. Return to J'Dhannar with the book and, with a disposition of 50+, he will agree to read the book and give up Skooma. He will also release Ahnassi from their marital bond. Return to Ahnassi with the news.
Note: If you have the book in your inventory already, you can get him to quit Skooma the first time you talk to him.  While this will skip his dialogue about still being Ahnassi's mate, it will not disrupt his releasing her from that arrangement.

Become a Very Special Friend
Once this is done, return to Ahnassi and you'll hear that J'Dhannar has indeed quit the skooma and has returned home to Elsweyr. Ahnassi now considers you her very special friend and invites you to visit her home in town, supplying you with a key. You can basically consider yourself as close to married as you'll get within the game, and you can use her house as your own. Ahnassi will now be found in her/your house from this point on.

She Knows This Acrobat ...
Once you and Ahnassi move in together, you have the chance to meet with Ahnassi's friend, Senyndie, at the Arena Fighters Quarters in Vivec. She just happens to be the Master Trainer of Acrobatics (meaning that you can train with her all the way up to skill level 100). Mention Ahnassi to Senyndie and the latter's Disposition will soar, meaning lower training prices, as well as a free copy of The Black Arrow, Part I, an Acrobatics skill book.

Flowers for the Lady
Speak with Ahnassi again using the share a gift topic to learn that she wants two flowers, a Coda Flower and a Gold Kanet. Sounds simple enough, and the gold kanet is indeed hard to miss in most places (look at the crossroads west of Pelagiad for instance). The coda is more difficult to find, and is actually the flower of the Draggle-Tail plants found along the Bitter Coast region. The best place to find them is between the town of Seyda Neen and the stronghold of Hlormaren far to the northwest. You can also buy a coda from Peragon at Moonmoth Legion Fort. Return the flowers to Ahnassi for her profuse thanks.

The Wizard's Robe
Once you give her the flowers, Ahnassi will ask you to steal a Flamemirror Robe from the wizard Mavon Drenim's lair in Vivec, Telvanni Plaza. Drenim is a powerful opponent and will most likely know when you've entered before you do. Either face the wizard and kill him if you can, or take the stealthy / runaway approach and take the robe from the closet (you can actually manage to squeeze yourself behind the closet, thus blocking you from view and allowing you to freely take the robe without being spotted). Keep it for yourself by thanking her for the tip or gift it to Ahnassi for 20 ebony throwing stars in return. Keep in mind that you may get a writ for Drenim as a Morag Tong quest, so you may be able to complete both at once (or do the Morag Tong one first and simply hold on to the robe). However, if you do this part of Ahnassi's quest prior to being given the writ from the Morag Tong, you will not receive any reward from the Tong because you killed him without a writ. (You can actually give Ahnassi any Flamemirror Robe, such as the one you might legally receive for completing the quest, "For the Love of a Bosmer".)

Blinded by Love
In the last quest from Ahnassi, revealed again by her share a gift topic, you have to retrieve Elvul's Black Blindfold (a glove actually) from the Imperial Commission inside Ebonheart's Grand Council Chambers. Ahnassi will tell you that it is well guarded, and inform you of a secret entrance located underwater just outside of Ebonheart.

If you take her advice, you may be attacked in the secret entrance by Furius Acilius wearing Lord's Mail, one of the best cuirasses in the game (but only if you talk to him).  He's tougher than the average fight, but the cuirass is well worth it. (If you are in the Imperial Legion, you may wish to postpone this fight for the armor artifact, because it is part of a major Legion quest.) After progressing through the passages, you will have to get by two locked doors (level 95), which can be tricky if your Security skill is low or your Open spellcasting not high enough, although the Worn Imperial Key found in one of the crates in the passage will open one of them, and a Scroll of Ekash's Lock Splitter can be used for the other.

The alternative route is simply to enter the Imperial Commission through the front door.

The glove is behind the level 50 locked door. Feel free to open the door via spell/lockpick, or pickpocket the key from Rufinus Alleius (who is in the Imperial Commission, too). Oddly, the Guards don't react to you at all in your attempts in unlocking the door. (You'll also find that you can steal with impunity from some other rooms in Ebonheart and its ambassadorial missions because many contain NPCs whose Alarm is all set to zero. They verbally protest but do nothing, and you get no Bounty.  It requires trial and error to determine the safe rooms, so save first.)

To complete the quest, snatch the glove from the chest of drawers, and return with it to Ahnassi to talk about share a gift again. She'll let you keep the item. (It should be used with caution, as it has a permanent Damage Marksman effect, sufficient to reduce any character's skill to 0; you would probably not want to accidentally harm a follower NPC with it, especially one you intend to keep around, such as Fjorgeir.)

This is all there is to Ahnassi's quests, though you will find that in her/your house, the two containers of food and drink will refill themselves after a while.

Quest Stages