Associate Many To Many

I would like to associate Records on a Many to Many using Early bound. 

The following is an example of how i achieved the association for 1:N, i now want it for N:N.

if (results.Entities.Count > 0)
foreach (var Risklines in results.Entities)
{
acs_riskassessment rsklines = Risklines.ToEntity<acs_riskassessment>();
rsklines.fabric_quote = QuoteReference;
service.Update(Risklines);

}
}