on gaining his wings he took millie up for a celebratory spin literally - and after she had filled a conveniently located paper bag she demanded that he return her post haste to terra firma , and then explained to him , in no uncertain terms , that this was his hobby , she was sticking firmly to her embroidery , and so his flying ability rapidly grew as he found more and more time to indulge his hobby , firstly by hiring the tiggy moth at every possible opportunity , then by buying it .