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You can say "I used to go out with your sister but it was a while ago and the only person I have feelings for is you. I wanted to be honest so I chose to tell you. Now it's your choice what you wanna do with it.
How do I say it
just say “i wanted to talk to you about something, i slept with your sister years ago” or something. an explain why and how you came across her but word it in a way that it sounds like a hookup and nothing more.
it can get messy if you say you liked her or mention any feelings
Oh nvrmd I didn't read it all, I would because personally I wouldn't want something like that on the back of my mind. Tell her now at the right time
You're gonna have just sit down and tell her. Because, the longer you wait. The worse it will become. You, don't want her sister telling her when they start an argument. With that being said, are you sure she don't know?
I don't know if her sister remembers me
You guys are gonna meet in some way.
How do I tell her
Can you pm me my xper doesn't allow