A penis milker, built by the Semen-Lord.

The Semen-Lord was not so much a supervillain as a lunatic. He thought his genes were superior, so was trying to spread them as far as possible, sometimes by **** some poor woman and impregnating her (with a turkey baster full of semen, not with his cock), sometimes he broke into IVF and other pregnancy assistance/induction facilities. He died when he decided to step up his game and impregnate someone with superior genes, he chose Ultimagirl. Caught her well enough, but Ultimamom caught him, snapped his neck and tossed him in the river. Ultimamom and Ultimaboy had interrupted the supervillainesses as they were ransacking his hideout and had retrieved most of his equipment. He wasn't worth having his stuff deployed in the trophy room, but they still held onto all of it, including the penis milker, essentially a fleshlight attached to a reservoir that he'd worn all the time to maintain his supply of baby-making fluid.

The stretchy material should work for Nishi's much larger cock as well as the Semen-Lord's tiny one, though he needed to fiddle with a few things, especially to make sure the pump was capable of extracting the volume of cum she produced and that it was absolutely sealed. He needed to test it to make sure, the only question was should it be him, or Ultimafuta who it was tried on...