I think this was really excellent doujinshi! I could clearly see improvement over the course of doujinshi. I think in the end your anatomy skills, shading and things like got really good thinking the first pages of this doujinshi.
And now about the story: I absolute loved it and I found it quite cute how Kakashi's and Obito's relationship did grow over the time. At times I felt slightly frustrated about Obito's stupid-ness but I guess that's just the part he is; goofy and rambling always before getting into the point. I loved how awkwardly Kakashi did go with Obito until he got enough comfortable, so they both could confess and be content what they're. I also liked how you included the duo taking care of Sasuke and Naruto. I found it just too adorable and if you're ever going to continue this, I believe those two little ones won't be like they're in canon thanks to Obito and Kakashi. Uuuh! I just loved this to pieces, lol. I hope my review was at least some of use, because I'm at the moment a bit fangirl-mode, mainly because all the cute moments in this but also the emotions, that you portrayed quite well. Life isn't all sunshine and rainbows, yet those two really made it! ^^