A dozen or so miles southwest of Boston’s class B, ATC directed me to fly east out over the ocean. I had planned other options besides KBED in case of delay. On the other hand I wanted to get home if I could. I turned to the new eastward heading and watched my required fuel ETA fuel reserve dwindle and my distance to KBED double with each ticking minute. With KBED backed up I was on a delaying vector with no time limit-ugh! I also knew fuel consumption was higher than normal due to a high density altitude. I knew I had taken the first step onto a slippery slope. I had to do something and do it fast.