The specific phrase in the search query points to the central "fauxcest" dynamic featured in many of these works. While not an official title, the term likely references the trope of an older sister and her younger brother ("Little Bro") violating a familial "Ban" or taboo .
The experience brought Alyssa, Brandon, and Max closer together, as they learned to communicate effectively and respect each other's boundaries. The "little bro ban" on Max was eventually lifted, but not before Alyssa's family affairs had become a little more complicated - and a lot more interesting. Alyssa Hart-Taboo Family Affairs-Little Bro Ban...