Where an agreement is only a guarantee for another agreement or constitutes aid which facilitates the execution of the object of the other agreement, which is not legally concreteised but is not prohibited by law, it may be applied as a subsidiary convention. On the other hand, if it is a mechanism intended to enforce the law actually prohibited, it cannot duet a right to the agreement, since it is vitiated by the illegality of the objective to be achieved, which is set by law. Where a person who has entered into an unlawful contract explicitly or implicitly promises that the contract is innocent, such a promise amounts to an ancillary agreement on the other party, where innocent turpitudes can actually bring an action for damages. “. . .