What about, and this would be entirely unconstitutional, but what if they were BOTH the president? Like, not one the president and the other one the vice presi

What about, and this would be entirely unconstitutional, but what if they were BOTH the president? Like, not one the president and the other one the vice president. If they were just, dual presidents. Both the singular president. ( if either died, it would be counted as the president dieing, and the vp would take the place)