My gf wants to watch me fucking another girl?

Me and my girl are both 23, she says she is straight and would probably never do anything with another woman. We’ve been together for a bit more than a year, and since very early in our relationship we talked about our sexual fantasies.

She told me her biggest fantasy is to watch her boyfriend (me) fucking another girl, one which we both find hot, not a threesome, just watching me and another girl having sex.

She also says that she has no interest in fucking other guys or opening up the relationship.

What do y’all think? Could she be bi and cant fully accept ir yet?