What to do?

Megan and I have been working on something together. Something that we are truly excited about and it's something that will hopefully be a series (since we already have four books outlined and in the works...). I'm not sure how many of y'all are involved with a collaboration in your writing, but this is the first time for me. I've been a Crit Partner, and a sounding board... but a partner in the entire process? Nope, not really.

The first story we're working on is one that came from Megan's brain. She wrote the basics, the characters, where she wanted them to go and handed it off to me. This is how we decided to do it, and it's working rather well for us... at least I think so. Maybe we should ask Megan. Anyway, there have been times when I thought the storyline should go one way, and wasn't sure I was seeing that in her plot... so I asked. She said it was "fine... change away... it's yours too." Okay. But I get the feeling that Megan isn't sure it's going to come out as what she wrote, while I add to what she did give me and go from there, I'm trying to leave the core of the story and the same scenes and movements...just with MY flair added to Megans. Does that make sense?

The story is slowly coming along, and we burn up the wires across country as we IM back and forth and ask questions and make comments and try to move forward. I don't want to do something with her characters that I have to adopt a bit, that she didn't want to happen to them... I think I'm meaner than Megan is... maybe... hmm.

Does anyone else have suggestions... ideas... for working in a collaborative effort with another author you adore and admire? Tips? Or do you think what we're doing is good if it's working for us? And, aside from my slowness, it is working, I think. Let me know what y'all think! It's going to be awesome if we can ever get it finished.