I would not ask to be moved if I were seated next to two unaccompanied children. In my experience such children are very self confident, used to travelling alone as parents live abroad and the children are off to school or returning to their ex-pat parents at the end of term. Generally they are very interesting and interested kids and of course can easily beat me in video games. If the IFF is new to me they sort it out for me much more quickly than any adult, and if I leave any food, boys in particular wolf it down. Any airline which implied I was a risk to children simply because I am male would find they would have a very irate passenger on their hands. If I am asked to change seats (and of course we all have been in our time for all sorts of reasons) and it is not inconvenient then of course I would but any suggestion of defamation would land them in deep and very hot water.