Thanks to a spark of divine inspiration from the Rule 34 thread I have had an idea, one I wish to share with another...in written form.
Anywho, Mass Effect, I play Shepard...and you play Shepard. No, not the clone thing (though fun idea, perhaps a one shot for that one later) but in fact, twins. Twin Shepards, put on the same team and rewriting the history as brothers, and all that good AU shenanigans. Background could be the same or different, hell it could go a number of ways.
If you're interested, message meh, we have much to discuss.
Sidenote: Yes, there isn't a lot to go on here, but I would hope any partner would know the Mass Effect universe well and be able to detail things together. I don't have a specific starting point or anything, so I figured it would be a discussion to figure out where to lay out their histories and where to begin and what's happened and all that.