but shun and haruto had a kid together, plus they basically lived as a happy family and couple throughout all those years before they found kiyohisa. So even if we only see shun and kiyohisa wedding, it's save to assumed they would not abandon haruto. Therefore, after the wedding, kiyohisa now joined their family of three. So all is married together.
oh shit! Σ(っ°Д °;)っ I knew I got confused somewhere. lol. Sorry my bad. ( ̄∇ ̄") You're right, it was shun and kiyohisa who had the kid. Haruto was the other guy. Wait, so... that other guy just remain as the other guy and never had his happy ending. (〜 ̄△ ̄)〜 And even throughout all these years shun and kiyohisa never had a wedding...? (⊙…⊙ )... until they found haruto...? ╮( ̄▽ ̄)╭ ummm... haha... ha...
a bit confused. ^___^;; What just happen? What's going on? How it become like this? I didn't feel like rereading from the beginning to make sense of it so... hh well, they all got married together at the end.