Lucidstuck II

Hmm... I guess we're forced into the binary. Unfortunately people can't get better if they're dead. That's sad. All considered, we'll have to lie to Derrick. Let's review what Alice said before this:

Derrick: I'm going to speak to the Sister in you that cares about me.
Derrick: That loves me. And wants to show it.
Derrick: What is in the box?
Alice: ...... It's a... Dead kitten.
Derrick: ....... Why?
Alice: You wouldn't understand. It's part of my sickness.
Derrick: Finally... Is this absolutely all you were trying to hide from me?
Derrick: This is it, Sister.
Derrick: You only get one chance.
Alice: ......

It seems a half-truth would be the best here.

> 1. Explain that you're sick. You killed the kitten and that it didn't hurt you. That you liked it. That you keep it because you don't like that about yourself. You keep a reminder for yourself so you know what you can do if you don't keep yourself in check. That you're sure that no one, not even he can accept you if he knows your heartlessness.

This reveals something about Alice--her self-hatred and cruelty--so she's revealing something about herself, but is also probably not what is exactly being hidden. Both requirements are fulfilled.