Weird Relationship Question - Bicuriousity Edition

So I've been dating this girl casually for a few weeks and after a date we came back to my place and she mentioned that she had been propositioned to experiment sexually with another woman and that she was going to go through with it if it was okay with me. She said that she's always wanted to do something with a woman and that she really wants to experience it - that it's been on her "bucket list" for a long time. She won't give me any details about who it is or how the conversation came about. For reference, we haven't yet "gone all the way". I'm moving in a couple months so this relationship is not going anywhere. It's just for fun.



So how would you feel in this situation and what would you do?



Also, how do I turn this into a threesome? That's been on my bucket list for a long time...

Weird Relationship Question - Bicuriousity Edition