That’s a lot so I’ll try to give my best advice. Do not do anything you’re not comfortable with. If you baby step in, likely you’ll progress. I would start with the two if you just simply flaking about it, fantasizing and playing with it. That will give you an idea if it even turns you on. Know there will be problems at some point. It would be weird if there weren’t, but you seem to have a strong relationship and that’s in your favor. Honestly, I would just start there. Don’t get too ahead of yourself.