Sakura/Tsukasa back story

Hello everyone! If you can't already tell, I love tbhk, I also over analyze everything and am the type to annotate for fun, over the time of reading tbhk I have made lots of theories and predictions, and here's where I'll be sharing them. NOTE: Anything from the tbhk manga may be referenced in this series including new releases/chapters and also the creator's Twitter page, so please don't read if you don't want spoilers <3