Because Asami didn't need Aki to wait until he came back, he wanted Aki to be ready to find him. Asami was waiting for another man, who had been avoiding the truth, and now he decided to take the initiative to find the man. Asami is ready to reveal all the truth.
What man? What truth? O^O
The most important person for him.
Who?? O^O
The new looks of AKIHITO :)
Just wait for him to tell you all :)
Asami has fear what if Akihito don't love him back so he forced himself on him which is a sign of love in his theory considering absence of parental love in his life, and he's getting some care and love from akihito and a deep friendship with Kuroda. so fans shouldn't underestimate his caring for akihito he just don't know how to show it, because he shows them in other manners.
if you have some spoilers fell free to tell me , just add "Alert Spoiler" for the fans who doesn't like spoliers ...I can't understand them I mean I'am dying to know the rest of the story.
Omg are you saying he doesn't love him? Nah you must be blind buddy. He cares for him so much! Of course he wouldn't take him with him he isn't nuts ! Who would take his lover to a battlefield where he could get killed anytime! Who would do all that and risk not only his life but at best all the efforts of the past years to get to the top to save a plaything (when yukhito was kidnapped by fei) ! Ps: I love the effect of aki's words on asami that cute and scary scene made mah day he just doesn't know how to express his love like normal people.
it doesn't seems that asami take akihito seriously , he treat him like his little kitten " age gap perhaps ?" but sometimes akihito can make asami shiver from fear ! like here http://www.mangago.zone/read-manga/you_re_my_loveprize_in_viewfinder/mh/v08/c053.8/16/ or when akihito said to asami to lock him if he don't want him to leave him ! asami was really afraid that akihito will leave his side ! but to take akihito words too seriously is very funny! I mean in this new chap when asami refused to take akihito with him , akihito replied sarcastically : "yeah go but you may find me fat when you return" (I read it somewhere ... ) so asami put akihito in tough training ... ;)