I ship those two so badly (๑•ㅂ•)و✧
I think, in the last panel Matsuo says something like this:
"Now that I think about it... Why are we both here alone?" and "what's happening here???"
So, yeah I am pretty confident that the author implies that they will become a couple eventually, and hopefully we will get to read how :P
Also the author posted this on her/his tweeter:
- https://twitter.com/ickwi/status/747486609176559616
saying something among the lines: " I was surprised to see many of you asking about Yuuki and Matsuo and I really enjoy it. I can't wait!" Well, at least that what google translate says it says XD
So it's official!!! Not only they become a couple, they are also getting married ٩(๑❛ᴗ❛๑)۶
Unfortunately, I don't know... But since the post was made in June, I am guessing we will have to wait a little bit...
I am really excited too (๑•ㅂ•)و✧
p.s. 1: there is also another alpha x beta pairing that I am aware of, if you are interested! the second story (spin-off) of "Kashikomarimashita, Destiny":
- http://www.mangago.zone/read-manga/kashikomarimashita_destiny/
p.s 2: I just realized, in my previous answer, my auto-correct changed "twitter" into "tweeter"... sorry about that ╮( ̄▽ ̄)╭

http://www.mangago.zone/read-manga/tadaima_okaeri/raw/4e618aadb9cda6bdff0beab5b3f97cb9_chapter-7/pg-26/
Does this mean that we can get their own love story too?? I dont understand what they're saying but they have a chemistry as a couple. <3 I wonder how an alpha male can get in love with a beta male. Hihi
Btw, I love the kids so much! They're so cute!!! and I find Hiromu so cool as a father and husband. Such perfect family hihi