u/Apprehensive-Set-375

So me(21M) and my Gf(20F)are relatively new to sex, We’ve been together for 8 months and had sex in our 3rd month together.One time napag kwentuhan namin yung Lesbian nyang friends, na kwento nya na medyo touchy daw sakanila ng friends nya. I brought up our dirty deeds then i asked what would her friend think about when she sees us doing the deed, she replied she might even watch. After that i had this scenario in my head where in me and her friend pinag tutulungan sya, albeit i’ll fuck her friend as well since i have a lesbian fetish. Is there a possibility where a threesome is possible? If yes, how?