Want to fulfill this fantasy for my birthday

So I have a pretty big fantasy of being able to watch her get fucked by another guy or even have sex with a girl and both our birthdays are coming up very soon so I thought it’d be a good time to bring it up. So for my bday present I get to watch her get fucked and for her bday present she gets a big dick. I’ve brought the idea of this up to her a couple times before to mixed results. She’s expressed interest in the girl on girl thing then eventually changed her mind and also expressed interest in another couple participating. She hasn’t really expressed interest in just her and another man but rather me getting fucked by another dude and then potentially her getting fucked by the same guy afterwards. While we have discussed this, I feel like she has never taken it seriously and today I’m going to bring it up to her again. I don’t mind any of the outcome as long as one of them happens. Honestly they all seem really hot to me so I’ll let decide. The hardest part to me is figuring out who it’ll be. She might not be comfortable with a dude/girl she literally just met. Anyways wish me luck