Bittercup Runneth Over

Bittercup Runneth Over is an unmarked quest in Fallout 3.

Walkthrough
Head into the Big Town common house and look for a death-obsessed young woman named Bittercup. One can either be rude or polite, but she'll ask the Lone Wanderer if they are seeing anyone, if the Lone Wanderer expresses a common interest. Regardless of how one enters and proceeds the conversation, she will hit on the Lone Wanderer.

If one tells her that no one understands them either, she will list every man she has dated in Big Town. After this, one can choose any of the first three responses and she will then want to start a relationship with the player character. If the Lone Wanderer tells her that they are not currently in any sort of relationship, she will become their girlfriend. She will modestly end the conversation, but if one returns to her once every 24 hours (or simply utilizes the Wait function), she will give the player character one of the following presents each time:

After approximately 30 cycles, Bittercup will revert to her pre-quest dialogue and will not give any more gifts.

Behind the scenes
The name of this quest is a play on the phrase "My cup runneth over," from Psalm 23:5 of the Bible, "Thou preparest a table before me in the presence of mine enemies: thou anointest my head with oil; my cup runneth over."