Promise him you will never ever get a tattoo without his blessing. I don't think he would be very keen on the belly piercing as you have guessed, but after you have had the ears pierced you may need a rethink first any way. Having your ears pierced means you will have to take extra care of them or they may become infected and you will have many dramas.
I wouldn't rush into asking him straight away anyways; let the ear piercings settle down for a few weeks first. I believe you would need a parents approval before you could get your belly button pierced and many would not go ahead without this, so don't consider doing this without his approval. My nephew is a tattooist and he will not attend to anyone under adult age (with or without their parents approval).
He has plenty of business to bother with underage teenagers.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.