Lily and Leo

Lily and Leo is an unmarked quest in Fallout: New Vegas.

Walkthrough
At a certain point, if Lily Bowen is the active Companion, the player may begin to hear a recording of children greeting their grandmother. This signals the start of Lily's unmarked quest. The playback of the recording of her grandchildren occurs when the following conditions are all satisfied:
 * 1) You have talked to Lily about Leo and replied about it (generally available in her typical dialog tree asking her about herself)
 * 2) You have witnessed her suffer a psychotic break during combat (health is reduced to about half or below, the player can cause her health to be reduced to half or below and does not have to be in combat and it causes the same outcome) and talked with her about it
 * 3) You have witnessed her taking her medicine and talked to her about it (new dialog option available in dialog tree asking her about herself) She says "Medicine Time" or "Grandma has to take her pills now, Dearie" when she takes her medicine.
 * 4) You have slept or waited.

To complete the quest, the player must listen to the entire recording and then open a dialogue with Lily. After asking her several questions and discovering that she has only been taking half the recommended dosage of her medicine, the player is given three choices:
 * Recommend that Lily begin taking the complete dosage. If this option is chosen, Lily will stop suffering psychotic breaks altogether, but will suffer some permanent combat penalties - these remain in effect regardless of her mental state.
 * Recommend that Lily continue to take half her dosage. If this option is chosen, Lily will continue to suffer psychotic breaks when she is reduced to one-quarter HP, but will now calm herself immediately if the player enters Sneak mode.
 * Recommend that Lily stop taking her medicine altogether. If this option is chosen, Lily will now suffer psychotic breaks when reduced to half HP, but will gain several permanent stat bonuses - these remain in effect regardless of her mental state.

The player's choice will also have an effect on which game ending she receives.