![](https://pic1.mangapicgallery.com/r/avatar/9c/u98250_50x50.jpg?2)
in terms of drama and pacing http://www.mangago.me/read-manga/dengeki_daisy/ should be able to match. and both have age gap and capable adult guys as leading men too.
for fantasy, http://www.mangago.me/read-manga/the_bride_of_the_water_god/ is somewhat similar but this one's got way more amazing art than blackbird. and more drama too.
![](https://pic1.mangapicgallery.com/r/avatar/80/u2337_50x50.jpg?2)
I classify this theme as Ecchi.
http://www.mangago.me/home/mangalist/73910/
Anyone know a manga like black bird ?