This is the outer connection port of the genital cover between Alexandra’s legs and is positioned right in the middle of her centre of gravity. The connection port is so flat and with its position, it’s almost invisible once Alexandra has been fully encased as a Bane, completely covered by her legs most of the time.
All bodily functions and needs are handled through this port. The drainage of urine and enema, as well as the refilling of Alexandra’s food and oxygen tanks within her breasts and the supply of water to her stomach, are all done through this port.
The maintenance port gets connected to the maintenance station, which performs all the supply, cleaning and hygiene processes, all under Lumina’s control.
This maintenance port becomes the sole connection to the outside world and break in Alexandra’s airtight encasement. Nothing else, breaks the Bane encasement.