Well, I can't miss a chance of someone writing a story for me, so here we go...

>> 1. Who is your preferred victim?
B (a girl) or A+B (a boy and a girl)
Might be siblings or even twins, but might as well just be classmates/playmates for the sake of variety

>> 2. How old are they?
Most probably B (elementary school) or close to that

>> 3. Do we know them?
I guess if I went all the way and asked for B (Kagamine twins), that would be too immodest, wouldn't it?
So let's just go with A (original characters).

>> 4. Who is doing them harm?
D. Self inflicted
(or each other in case of two victims)

>> 5. Is sex a part of the story?
A (no) or B (only nudity) but still A (not sexualized)

>> 6. The victim's participation is?
E. Smug. Maybe they're playing some children's game with other children and discover a way how they can use dying to win. Or maybe they just think of killing themselves for fun as beating the game of life.

>> 7. What are the most important elements? (Don't give more than 2 answers)
C. Death
E. Fun

>> 8. Who is telling the story?
C. A narrator (third person)

>> 9. What is the setting?
Does contemporary world but with casual attitude to nudity, sex and death count as A or B?
Although it can also work if the world is normal (but stays outside the story) and only these characters are like that.
That would fit with the smug attitude.

>> 10. What other interests or requests do you have?
A. Injury or loss of life treated casually
C. Cuddling/fluff (would be nice, but not sure how that would fit together with smug attitude)