Her and her sister, what do I do?
Sooo, kinda sticky situation I've gotten myself into.
At the end of last year when me and my girlfriend broke up, and I jumped back into casual dating pretty quickly. I was just having no strings attached fun, partially to try and get over my ex(obviously). One of the girls that I saw consistently for about 2 months, decided not to see me anymore because we had known each other, through friends, for several months and she wanted a relationship that I wasn't ready for. She was a little upset and said she felt used(understandably so). Very sweet girl though and respectful of my feelings and situation which is why I want to try and return the favor...
It has been about 8 months since the last time we hung out and I just started seeing her older sister. It has only been a couple weeks, so this is still a casual relationship(but a sexual one) and sooner or later one of us is going to have to tell the younger sister. They are 5 years apart and aren't very close, and we briefly discussed telling her the other night with no definitive conclusion on what to do.
My question is who should tell her? When to tell her? The girl I'm seeing now doesn't want to tell her sister, at least not soon, but she said I am free to if I really want to, HELP!