Should I start seeing this new girl I met?

[Stevek]

You should probably make sure that there's no potential with Amy in the foreseeable future. She's your age, so, if you're in danger of catching feelings should you happen to spend time around both sisters, that might make for some weirdness.

Are you friends with Amy or just acquainted? I mean, since she has to experience, is she a person you would ask for support if you need to discuss a non-monogamy issue? That might also have to stop, you should probably let her be the confidant of her sister.

Amy is not my age lol. She is most likely in her mid 20s. I only see her in the gym sporadically and our interaction is limited to a curt nod or wave of acknowledgment. So we are not friends. I am depending on reddit and this forum for advice. I will leave Amy to Kaitlyn. Thanks for explicitly mentioning this. Good perspective for me.