im thinking of a saddle that is slightly extended to allow a second person to sit behind the person who pedals...

any such thing exist?

someone pointed me to a long banana seat, but that seems to require an extra bracket (sissy bar?) that extends from the rear wheel. if i could safely use a banana seat without the extra bracket that would be perfect... im looking for something that i can use to fairly quickly convert my bike from a single rider to a two-person bike

the combined weight of the riders will not exceed the bike's weight rating...