Very simple in my case, I have known that I have liked man feet since I have been 7 or 8, but the necro part came to be when a guy I dated for three years, Ron. was lying in bed with me one night and I was fucking and sucking his soles as I did every night, well, to make a long story short, he had been out partying that night got home and we went at it right away, I went at his soles at once, turns out he died in his sleep from a coke overdose 20 mins after arriving home, so I was at his feet all night unaware they were dead till morning. finding out he had died while I was doing his big feet shocked me at the time but the more I thought of it the more it turned me on. I was licking, biting, fucking and sucking, burying my face in his sole meat for hours as he lay there dead. So yes, it was a step forward for me. now even going to his grave gets me hard an feeling good. this all happened when I was 22 years old and he was 34 yrs old, always had a thing for a bit older dudes.