Helping Your Boyfriend Ending 3: The Empty Cage

You are rescued, and both brothers vanish.

Spoiler warning. This page describes how Ending 3 plays out.

Requirements

Take the pill on night one and get Ian's scalpel.
Use the scalpel on Day 3 and win the struggle.
Adrian's affection at -3 or lower, so you can search his body and find the key.
Open the locked basement door, reach the phone and dial 015767438.
Tell Oliver the right address: 742 Silverwood Creek Lane, Silverwood Springs, CA 95401. You can only read it earlier, from the package beside the bed in Adrian's room.
Ian's affection below 40.

Step by step

During the Day 2 investigation, click the package in Adrian's room before you leave.
Keep Adrian's affection low through the later scenes.
After the fight, search Adrian's body for the key, then use it on the basement door.
Dial the number and give the address on the call.
Do not push Ian's affection to 40.

What the ending shows

Several months later you are recovering in a hospital with Oliver beside you. It is revealed that Adrian was a serial killer who kidnapped people and had them carry out his dissections. Adrian is missing. Ian is missing too, and no one knows where he is. The title card reads ENDING 03: The Empty Cage.

Want Ian to be okay? Try Ending 4.