Preggy Gf wants to try another dick now

So we found out that we were pregnant 3 weeks ago. For context, it has been my fantasy to see my girl being fucked by another man. She knows about this and hindi niya talaga sinasabayan or trip nung una. Kapag nagsesex kami need mo pa siya pilitin bago niya sakyan yung fantasy at banggitin yung mga kunwaring thirdie namin.

All of a sudden now, nagtatanong na siya kung pwede daw ba siya magpakantot sa katrabaho niya and she seems serious about it. Sabi ko lang na oo basta kasama ako pero I am a bit hesitant. Idk if ready na ba ako or not for this. Any advice or thoughts?