The special edition comics are all rewrites (by the original author) to make Kal and Anna siblings instead of aunt and nephew. The author's blogspot page is no longer being updated, and the entire series (regular and special edition) can be found at the author's tumblr: https://www.tumblr.com/tirayugen
Yeah this story makes a little bit more sense. Unless implants are involved breast don't keep growing naturally after a certain age. So this being his older sister that was still in her teens when they were yougner, yeah that I can accept.