Cho hai người khác?
how appropriate for Valentine's Day! lol (which was today,2018)
anh ay muon di chet
He's catching fish with both his hands.
Couldnt you just say "Anh ấy đang viết hai bức thư tình yêu"? Doesn't đang already imply that the person is in the process of doing the actions involved?
I guess it's emphasis.
In English is the same:
He is writing.
He is writing in this moment.
He is writing in this very same moment.