The thing is you have to be careful with pushing your girlfriend to get together with the person from work. If you both do decide on going after your girlfriend's workmate. What do you want to happen, does he know about you, is this a one night stand or do you both want to form a longer...
I know that I am not female, but I have had experience in the past getting females to cuckold there partners with my help.But here are the main pointers on what I would do with new couples in your situation.Firstly never push the female to do anything that they are not too comfortable...