My Sister is having sex with our Cousin, an I'm feeling evil.

[Anonymous]

Just recently I got my sister's old phone as a temporary replacement for my stolen one until I get a new one this Christmas. Her new phone and this phone were still merged so I can see anything she texted. She was texting our cousin and I wasn't going to look until I seen a notification that said "you kept moaning." So of course I snooped only to find out that they've been fucking. They already did it three time and at the beginning I felt sick to my stomach I still do, but now that I've had time to think I can use this as an advantage. So I screenshot their messages and saved them on my accounts. So I could blackmail them into getting what I want. Weed, money, and even alcohol. She just turned 14 and he's 16. I know I'm a bitch for this, but I could care less. Not only that but it was his first time and she's already done it before with a different guy. I already knew she would lose her virginity before I did, but really having sex with our cousin. Which is highly frowned upon in our family. We were told if we ever had sex we'd be shipped off to live with our dad. She hate the idea of even being two weeks with him. If I tell they won't see each other for a very long time. The woman our cousin stays with is like a second mother to my sister and if I tell she won't be going back there until she moves out of the house. So I know they'll cooperate and if they don't I won't tell everyone. Just all the people that matter(the entire family). I know I'm sick, but she's lucky I didn't tell the minute I found out. The only reason I'm keeping it a secret is to benefit me.

This looks like it could be rape, but if you've read all the message it's not. Not only that but, they're planning to do it again tomorrow. Don't know if I should start being evil now or wait. I mean I should stop them from having sex since I'm the older sister, but I can't stop what's already been done. I will eventually tell on her though, but after Christmas. She better enjoy herself for the time.