Choir Boy (novel)

Choir Boy is a 2005 novel by Charlie Jane Anders.
Plot.
Berry, a twelve-year-old boy, wants nothing more than to remain a choirboy. Desperate to keep his voice from changing, Berry tries to injure himself, and then convinces a clinic to give him testosterone-inhibiting drugs that keep his voice from deepening but also cause him to grow breasts. Suddenly Berry's thrown into a world of unexpected gender issues that push him into a universe far more complex than anything he's ever known.