Warning! Mine Field Ahead!

Personally I'd never shy away from something just because the subject matter's sensitive. I can think of at least one (very successful) book written from a similar perspective, so the only question IMO would be: is it any good? If the answer's yes, do it.
I wouldn't have the first clue about where to place it, though.

Child abuse stories are very touchy. And plenty out there. It's not to say yours have no merit -- I think every story deserves to be told. But what makes yours better than the others, and not just another catharsis? Telling another sexual abuse of a child is probably only going to make people feel very uncomfortable, instead of "educating them" (most people already know how horrific it is). The fact that it's a vignette instead of a real story might also limit your marketability. It might be more difficult to find a market for raw and controversial material to begin with. Some literary mags might take it. Anyway, good luck!

I think also, to some extent, it's a subject that has been hijacked in recent years, with the result that many editors, when they publish submission guidelines, will openly state that they're not open to stories on the subject. (That's the shame for genuine victims of course, who might wish to explore the issues via fiction.)

Zoe