Omega has given you choice to allow or disallow 10 rapists to rape someone. Why 10 rapists? Omega knows the absolute utility across all humans, and unfortunately as terrible as it sounds, the suffering/torturing of 10 rapists not being able to rape is more suffering than what the victim feels.

Errr... I don't care? I'm not a utilitarian. Utilitarian morals are more or less abhorrent to me. (So in conclusion I'd tell the rapists that they can go fuck themselves. But under no circumstances can they do the same to anyone else without consent.)