Becoming my boyfriend's brother's pet

Synopsis

Being gradually tamed by my boyfriend's best friend, right in front of him, into a breeding bitch that only knows how to rut and moan... Just how intoxicating is that shameful, leg-weakening experience? From shyly resisting to actively swaying my hips begging for sex, to being creampie'd while wearing a collar right under his eyes... Is this transgressive pleasure truly addictive?