How do I stop it?

Lol you know he's fucking the shit out of your sister already.

>>18268428
As far as I know all they've done was kiss and go on a few dates. It's almost inevitable. If they do I feel like they have to get married. If they break up I lose a best friend, if they have arguments they'll come to me, If I take sides they turn on me.I can't gain from this just lose.

>>18268474
Just cuck your sister if anything happens

>>18268474
you don't lose a friend if they break up. That's stupid.

They're going to go ahead with it regardless of how you feel, so you should just get over it, now.

>>18268490
They hated each other before they started "not dating". I don't know how they started getting along but they did. Also you're right I'm already losing a best friend because they are always together, If anything I'm getting my best friend "cucked". While I have to watch him all over her.

File: F8hIAON-1.png (475KB, 680x474px) Image search: [Google]

475KB, 680x474px

She's trying to make you jealous OP, and it seems like it's working. Make your move.