I'm the oldest in my family an if I caught my sister or brother into something like that or certain things in general I have to leave it alone not my business her house her life that's all there is to it but another part of me as someone who cares for there siblings I'ma have to see where there mind at cause you wouldn't think as someone whose younger than u in ya family u wouldn't expect that not saying hey they ain't gonna be sexual in anyway but fr tho I can't see my sisters doing that
It was none of your business. Does she know you saw?
Nope.
Then just let it go. You have sexual proclivities that are private, I'm sure. Respect her privacy and just move on.
Scroll Down to Read Other Opinions
What's Your Opinion? Sign Up Now!Move out. Don't be with perversion.
Give her a high five. She's entitled to do whatever lights her fuse.
You do nothing and say nothing except you might ask her to be more discreet if it’s appropriate.
Consenting adults. None of your business.
Treat her like normal, beside I get a sense jealousy on your part. That she was part of one and you never had one
its her life, her choice. unless she brings it up, just pretend you seen nothing. nothing for you to do.
Join them lol
That's something girls only do
Let her live her own life and try to ignore it.
Why do you feel you have to do something? I dont understand, its her business, right? BJust relax in your life your sisters threesom won't be anything to what you'll see, things change so just let it go, right?
How do you know for sure it was her?
Leave it alone. It's the best you can do.
it was really strange for me.
@julieta00 have u tried a threesome?
Don’t bother saying anything and leave it alone.
These things happen. Just put it down to experience...
Rate her on her performance? 😗
Man up and shut up. Your sister can fuck and be fucked however she chooses to be. If you're allowed to fuck girls when you want she can fuck guys when she wants. Don't be a little bitch about it. Just accept the fact that she can pull in dick like a champ.
You could always ask her to keep her bedroom door shut when doing those things.
Tell her it'll be fucking funny because she will feel emerassed then it'll be funnily awkward
she human treat her like one
she is your sister, accept this as part of who she is, give her a hug and quit judging
Treat her like she's your sister... im sure there's things that you may do that she could judge u on but doesn't.
Sexual Relationships 
Sexual Health 
Most Helpful Guys