So you want a fatwa on PDA!!! Hilarious
Allah knows best but I can't remember if there is anything specific. I did read a fatwa once about a husband and wife holding hands in the haram shareef in makkah and they said it was fine.
There's that hadith about the prophet
walking with his wife and him telling others they met that this was his wife so they wouldn't think anything.
I dare someone to ask their shaikh if PDA is Islamic or not