Wait... you are saying that you kinds didn't want to skip school and now you have to eat prunes with your dog? :o
In few years they will be so sick of school they will beg for a day off.. and you will remind them this! Ha!

I know those plums. In Poland they are actually pretty popular and are best to make nice thick jam (Powidła ). It would go so well with that cheese too. Google says it takes sugar, besides plums, to make it. My mum makes just just out of very mature plums. No sugar needed (or very very little).