EF6 Set Relation Table With Different Column Name Using Fluent API

Question

I am trying to make n-n relation with rel table using Fluent API but i am messed up with inconsistent column names.

I have Service and Feature objects simply like this:

public class Service
{
    [Key]
    public int ServiceID { get; set; }
    public int FirmID { get; set; }
}

public class Feature
{
    [Key]
    public int FeatureID { get; set; }
    public string Description { get; set; }
}

And I have already defined relation table:

ServiceFeature
--------------
ServiceID
FeatureID 

Normally I can map like this:

modelBuilder.Entity<Service>()
    .HasMany(e => e.Features)
    .WithMany(e => e.Services)
    .Map(m => m.ToTable("ServiceFeature").MapLeftKey("ServiceID").MapRightKey("FeatureID"));

But here is the problem: ServiceID from ServiceFeature is actually FirmID from Service and I couldn't figure out how to map it like this.

Is there any way to define column names for each table?