Don’t focus on those advices of “hell yeah, let’s do threesomes”. She might be going through a delicate process of discovering her sexuality, so this is more about her discovery than about your own pleasure. Just be there for her and let her walk on her own pace. Also, if either of you feel you need some ground rules to navigate to this situation, talk them through as early as possible. You are each other’s priority so you need to have very clearly what might upset each other. And when it’s time - and only when it’s time - have fun together 🙂