I got the link to the matrix, but missed the 1, so I missed the overall point there. Just glad it was intentional.
As for the work in general, I can only say that I like where the story appears to be going. Whilst Im not a fan of the overuse of Bi chracters, I accept that it makes setting up a poly relationship a lot easier. I also like the idea of including other pairings/subgroups in the overall group as Im sure that group members with benefits is the only realistic way for a larger group to function, a large harem simply couldnt work with only one focus, too many of the group members would be getting too little attention.
Something that I thought of in the last reading, I would imagine that the group would require a current STD checkup before someone can join the group, prefereably before having sex with anyone outside the group.