I adore enterprising young Sirius here! It feels very in character. And poor Reg NEVER wins, does he?
Can I ask a favor? There is a poster called leochi who is a teacher by trade and an artist by avocation. She has started a new communinty called yay_potterkids for totally kid safe stories and art in the Potterverse. This would be perfect there and if you connect it to one of the prompts on this table like chocolate or yummy, leochi will illustrate it eventually.
http://leochi.livejournal.com/233960.html?view=2967272#t2967272