Do you know any manga that fall into any of these categories?
-Rich seme in relationship with poor uke
-Old seme and young uke

I'm also looking for this yaoi manga:
A demon sealed in a book (its either a book or a clay pot) is released by this old man (not super old but he has a daughter and grandchild), and he and the demon fall in love.

Here's another I'm looking for:
This kid has a crush on his neighbor and one day he comes over to his neighbors house to find that the neighbor takes in young boys in exchange for them letting him video tape them.

There's no I in TEAM but there's a U in SUCK

The demon sealed in the book one is Blood hope

The last one is Kimagure love cupid, the 4th story called "The Big Brother Next Door".