Sequels I need to finish (or start) watching....

For some reason, if I begin an anime I feel obligated to watch its' sequels as well. Unfortunately for me, I still feel obligated even after I fall out of love with an anime. So, here's a list of some sequels I haven't found the time to watch or am in no particular hurry to see, but somehow feel obligated to watch:

1. Dog Days'
2. Bakuman 2 & 3
3. Gintama'
4. Aquarian Evol
5. Amagami SS Plus
6. Genshiken 2 & Nidaime
7. Sengoku Basara Ni
8. Rinne no Lagrange 2