ehh.. i don't know if you guys read same series... or just really lack of attention to the series... it always amano that is the late boomer and want to play safe with their relationship... she doesn't even realize it's love until just couple of chapter ago... sure, she is the dominate one in the relationship, but she always intended it as friendships...
something can't be said for manabu who fully aware something changing in amano... he want to address it LOT OF TIMES! well, him self is denial because amano is still childhood friends and still see her as such ( i don't think that girl even played lot of role in manabu himself other than inspiration at this point)...
at least now both party fully aware that their relationship can't be trated as normal friendship anymore and they has future they need to faced especially in their relationship...