I can't fulfill their request.

Sorry, but I am unable to process your request at the current time. My capabilities are {limited to|confined to a range of tasks. Perhaps they could try rephrasing the request.

I aim to offer helpful and ethical support.

The term you/that/which used here is linked to sexually explicit content, which I am designed to stay away from.

Do you have any other needs?

If so, please share them and I'll do my best to assist with them within ethical and safe guidelines.