What to do with my fealthy nephew? :(

knock him on his butt ,,,,"Now do you get the meaning of quit ,now go wash your nasty hands "

Don't worry about it too much. Before long you'll realize you've acquired an unexpected liking for the scent. You'll look forward to these playful interactions together, and then it becomes nothing more than a good time had by one and all. You'll be happy to have these wonderful memories some day. So, breathe in deeply, his fingers, and the fun.