stephen howells , 39 , and nicole vaisey , charged last summer with sexually exploiting the amish girls and other children .
each face kidnapping and federal child exploitation charges after police say they abducted the girls , then seven and 12 , from their family 's farm roadside vegetable stand on august .
on tuesday , st. lawrence county district attorney mary rain said that the defendants were advised of the strength of the evidence and offered an agreement to plead guilty in both cases .