Since the point my wife admitted only being attracted to big men (in stature), I'm 5'6", she still claimed those guys she screwed were only slightly bigger than me. (attempting to ease my feelings)
In my best days I was 6-7" and three fingers wide. I haven't had but 6 other women, of those 3 I could not fully penetrate, but my wife never had a problem wanting more.
I did on a few occasion witness her react louder and cum harder that she ever had with me, those three and all she admitted to were quite larger than I. From then on I was only getting off thinking about her with bigger men.
The one that would become my main fantasy man was my best friend, about 6'8", tall dark and handsome to be sure, 9" hard and when he was ready to blast the 4"s behind the head would swell so large it would lock itself in behind your teeth. He was one of the few she risked bareback fertile sex with (while she thought I wasn't around) simply because He turned her on so. She declared blatantly how much a better fuck he was. She would swallow his load, take him in the ass, which she would not do with me. Her sex with him was so good I became jealous of her. At one point she realized this and after sucking him for a while she told me to finish him for her, and she jacked me while watching me swallow his load. His praise of my efforts made me feel great and I have craved his cum ever since.
Being a small man I seemed to always have a penchant for crossdressing. Sometimes when I new he was coming by and My wife was out dancing, I would put on panties and a bra under my clothes in hopes that it might be one of those nights he couldn't wait for her to get home and take some head from me while waiting. I was always desiring to suck him off whenever he would let me.
I never fully had the guts to completely dress for him like I craved to and only got to have him take my ass once. A night my wife was gone for the night. I cooked him a big steak dinner and fed him drinks all night treating him like a king.
If I could go back I would have found a way to be his complete bitch and still would to this day for any larger superior man, but especially larger men that have had my wife and made her orgasm, which she now admits I never have.