It seems praising Sheogorath for Terennus haven't been very bad, so he preached him and he response asked him for lot of fish... for some reason... then Sheogorath forgot about Terennus so he ended with a lot of fish and wealthy pockets, he prepared quality dishes and sold them at high price...
For Terennuss sake I hope Sheogorath do not return for his dues of fishes...