Instructions
Talk to Kelly Chambers at her introduction. Kelly introduces herself at the beginning of the game and works as a part of the ship's team.
Agree to call Kelly by her first name when she offers this option. Highlight the appropriate dialogue by moving the right control-stick and select it by pressing the "X" button.
Select flirty, casual dialogue options every time you talk to Kelly. When the dialogue option that allows you to ask Kelly to dinner appears, select it. At dinner, select the option that asks Kelly to feed your fish.
Complete the Omega-4 mission under the time limit. If you fail to complete the mission, Legion's Loyalty Quest, Kelly will die.
Move the mouse over the intercom and press "X", once you return to the ship. Select the "Kelly Chambers" option and select the dialogue that invites Kelly to your room.
Talk to Kelly when she enters your room. Select either the dance, cuddle or embrace option to engage Kelly in a romantic entanglement. Unlike other characters, Kelly cannot enter a love scene with Commander Sheppard.