I have always had a big crush on my best friends brother and I know he likes me too but anyways my best friend and her sister both have big butts and big boobs. Does that mean he has a big dick? I think he does because he has a big butt and this one time I was making out with him and he was right up against me and I could feel his dick through our clothes. If felt really big and I know he had a ***** because he told me not to look down. But anyways is their a correlation between sisters and brothers and sizes of their sex organs? Thanks please be very detailed