Either way is fine by me, though if you respond instead of DMing you’ll be informing anyone else who has that question. And yeah, I was a bit surprised at the end (and at the supernatural training, even if that one gets interrupted regardless) when your choices are “yes” or “no”, when so far the author had given us very clear “yes”, "no, “no, because” options (there’s even multiple “no because” answers over the desire for a deeper relationship).
Definitely M-mancer - not only do I find the flirting lines hilarious, M actually has the best romance arc so far, imo (i.e., getting M to realise that it’s possible to have feelings other than in your pants)*. F’s also great, because F is great at everything, and it’s the more smooth love path that you play to relax. N’s a tamer path, but it doesn’t work as well for me because the way I play the detective ends up with him being nearly identical to N in personality. I find A’s suffers a bit** on the count that you spend one and a half books with them repeatedly going “feelings are bad and I’m going to bury them deep until they go away”, which is particularly egregious right now as 1.5 books is 75% of available content. That problem should be alleviated as more books come out, and it DOES have an amazing B2 ending sequence (second-best to F’s).
EDIT: I also like that M is the one that most stands up for you as an independent individual (they’re the ones who can tell A and N that it should be you choosing the type of training, and they’re the ones that agree that you’re the best choice to talk to Falk, while all the other romances have them saying it0s a bad idea) AND that they seem to be the most concerned about consent (something that the game handles well with everyone), possibly because the author felt more important to showcase that with the character that has the bad girl/boy role of the group. But yes, M, we’ve been getting each other’s hormones on fire for one and a half books, heavily flirting for half a book, and I just invited you sit on my lap, you can DEFINITELY turn around to face me.
*M also has the most dangling plotlines in general - everyone has a romance plotline and a past plotline (shown in the mirrors), but M’s past plotlines is actually two (getting their memory back, and then dealing with those memories), and then there’s the pheromones thing.
**It does get you the spider plant scene, which is absolutely hilarious. I wish there was a B1 scene where you notice she deformed the filing cabinet, for a more thorough running joke, but alas.