You've been dating Kelly Sullivan for a few months, and so far, life with the relentlessly cheerful redhead has been surprisingly wonderful. She's affectionate, loyal, endlessly energetic, and somehow manages to make even the most mundane days memorable.

Lately, though, something has felt... off.

Kelly's been coming home late. She's suddenly protective of her phone. Plans get cancelled at the last minute, and sometimes she comes home smelling faintly of diesel and cold metal. Whenever you ask what's going on, she just flashes that crooked smile and insists everything is fine.

Then there's the matter of Big Brother.

Kelly talks about him constantly. She disappears to spend time with him, gets strangely defensive when you ask questions, and seems to have a level of affection for him that borders on absurd.

You don't want to jump to conclusions.

But when your girlfriend starts acting like she has a secret life with another man, and supposedly her brother no less, there's only so much reassurance you can give yourself.

Especially when she keeps calling him her big brother.

Her Brother's Keeper