Well, to be honest, if I were your agent, I would really want to show you all the homes. You really are wasting the listing agents time only because they are not writing up the offer for you and yet you are taking their time to show you the property. I don't think that is really fair to them when your agent should be doing this for you. Your agent should show you all the homes you are interested in.
I understand your frustration that it seems your agent is too busy for you. However, she should be out there taking her time and showing you each house to earn her commission. If she is too busy, maybe she is not the realtor for you? You need someone to fully represent you.
If you did have the listing agent show you a home that you must see right away, I would be completely honest with him/her and tell them you are working with an agent and if they are not too busy, maybe they could just show you the house. Make it clear that they won't be writing up the offer for you. I would let that listing agent make the call. Most of them will say your agent should really show you because in order for him/her to fully write up the offer correctly for you, first they should see the condition of it. Maybe there are some things you would not see and remember to tell your agent.
I actually had an agent do this to me before. His clients called me to view the home, I went out of my way to show them and they loved the house. He sent me an offer that night. He never saw the property. This is not a good practice to get into, but some agents do it. There were things missing in the house that he could have asked for, but did not since he was not there. The roof needed work of which he did not know as he did not come out, so he did not put it in the offer to have a roof inspection or certification done. It was in an HOA and he did not even know this as he did not pull up the MLS print out. It was in a high wind area and none of them had a clue as they were about an hour away from this home. So, long story short, if he/she had been there from the beginning maybe they could have talked about all of that before making the offer.
My best advice to you is this, make your agent show you all the homes. He/she is working for you and should be available to help you. I would not ask the listing agent to show me unless I fully disclosed that I was working with another agent and could they show me the house. They will probably ask you why your agent cannot show you as well!
Joan Patterson, B.A., A.S.P., G.R.I., Realtor
Keller Williams Realty