Becoming My Boyfriend's Bro's Breeding Bitch

Trained bit by bit in front of my boyfriend by his best friend into a bitch who can only moan and beg for it... How addictive is that shameful, knee-weakening thrill? From shy resistance to actively bucking my hips and begging to be fucked, to wearing a collar and getting creampied right under my boyfriend's nose... Is this kind of taboo pleasure really addictive?