This would be the first time a GM thought Bless worked like that! I thought so myself, but all the GM's who I've played a cleric with says that Bless can only be used once per casting, and only for as long as the casting lasts. I suppose having a miniature bardic inspiration that you can cast on three different people at once seemed too good to be true, but I'm glad that you'll let me use it like this. It certainly makes Bless and Kyra more useful.