Fill-in?

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             He put his arm around my shoulder and I stiffened.            “So what am I, Mathew?” I continued. “Some kind of fill-in? When you haven’t had a girl pay attention to you for a while, you pull me in? Do you do it in front of Bobby because there’s a pretty good chance I won’t object? Good old Morgan, she won’t cause a scene.”He finished his beer and went to get another.            “No.”            “No what?” I asked.            “No, you’re not a fill-in,” he answered.
            “What a relief,” I said sarcastically.