Is it normal that i crave husbands friend

i love my husbands best friends cock.i am not intigued by him but his cock and his abilitiy to make me have orgasm after orgasm.his penis is eight and one half inches but what i love the most is the thickness that stretches me open to take a very hard pounding!while my husband has watched it is when we are alone that he has given me the more intense poundings that i have ever taken. So is it normal for me to want this or should i not enjoy a bigger better cock?