This situation has three aspects.

  1. I knew these two sisters during high school. Megan and Amanda. They're two years apart. Megan obviously had a crush on me, but I was too much of a beta bitch to escalate. After graduation I didn't talk to either of them for years, but we are still friends on social media. They don't live together anymore.

  2. Fast forward to just a few months ago. I randomly messaged Megan and setup a date. We hooked up but I ghosted her afterwards because she has mental issues.

  3. Today on social media, I posted a collage of pictures from the past year. I'm quite social, and involved in different hobbies, so there's alot of pics. Some with cute women. Amanda (Megan's sister) saw it and messaged me that we should "catch up" soon.

With any other girl, I would say hell yes to "catching up." But part of me thinks she might attack me for pump-and-dumping her sister. Also, Amanda is "in a relationship" according to Facebook. How to proceed?