48”

Any man would accept the average length of a penis to be “good”, and “regular”. Being that you’re dealing with futanari, though, normal circumstances are far different. As they say in a certain Terran region, “everything is bigger in Texas”. This sentiment seems to have transferred to futas as well, especially your model.

Your AI-O will have a cock far larger than what’s considered “normal”, even by futanari standards. Standing at perfectly four feet long while erect, and as thick as a human thigh, your model’s dick is certain to please.

Now comes time for the finishing touches of your AI-O. Your model’s futanari cock needs a set of balls to go with it. How large did you select for them to be?