I hope this is ok for me to ask sense this is a f/f group I was wondering if maybe twilight x cadance storys or Twilight x flurry heart storys if that's ok for me to ask ?

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Here is a group with Twilight x Cadance stories: Twidance
I would recommend using the search tool, filtering by: romance, Twilight Sparkle, Cadance and excluding Shining Armor. It won't bring exaclty a story of those 2, but it will help.

And about the other pairing, I don't think I have seen an story about those 2.