Gil Brodie: The Friend
Check your email after completing Hunting the Archon for an invitation to meet the notorious Jill on Eos.
Stop by the navpoint at the Prodromos shuttle pad, and Jill will come bounding out.
If you're not in a relationship with Gil, she just has time for a few quick gibes before heading off again. If you are pursuing a relationship, you can cement it here, though the final cutscene is bugged, and will not always play (it may play later in the game.. or it may not).