I've read the earlier fic. I'd be happy to help with a general SPAG and typos scrub if that's mostly what you want at that point.

I also have an initial beta-reader (who I'm messing about, having now developed RSI!) but would be keen to get a similar additional final-check once-over for mine towards the end of the time. It'll be ~30,000-35,000 by then:
McShep plus team - an on-Earth near-future sci-fi AU with bug!John. NC-17 (mainly for sex), some D/s dynamics in the pairing at times, plot mostly action/adventure/personal journey.