Outlast the Reaping.
First things first I have no idea where to post ideas for stories that you don't have the ability to write so I'm just gonna post it here. Sorry if it's the wrong space. Okay so this is my idea for an Outlast/ Mass Effect crossover. Miles Upshur is possessed by the Wall-Rider but he remains for the most part in control. While Waylon Park (from the Whistleblower dlc) flees the asylum Miles remains to make sure none of the inmates escape and no body from Murkoff comes snooping around. While he is digging about in the labs he finds a strange machine that transports to the mass effect universe. It can either be a time machine or a machine that allow him to cross the dimensions. It can start at either mass effect 1 or 2 and has to go through the entire series. Character development is largely up to you just study Miles notes during the game and don't forget to include the initial revulsion he will probably have from being possessed by the wall-rider. Anything after that is up to you. Romance is also up to you. Please for the love of god no gender bending or anything like that. I think that's it if you have any questions please contact me. I look forward to seeing what you write.