A Japanese sex game

She pulls out a box that displays a white dome looking thing, that kind of looks like a sleep machine. Confused, she instructs you to sit down.

"Yay! We get to play a game!" she excitedly says.

Both naked, sitting across from each other, she pulls it out of the box.

It's a small white half-dome about the size of a tupperware container, with two cords coming out of it in opposite directions. She checks to make sure that there's batteries in it and then sits it back down.

One cord has a cylinder-like white object with a larger mushroom head on the end, looks like its made out of rubber or something. The other cord has a larger white oddly-shaped cylinder with an opening on one end and a lot of ridge lines on the inside. She tosses you that one. She then hands you a flat panel with a green, yellow, red, blue, white and black button on it, you both switch it to "ON"

She's perusing the rulebook, while you examine what you've been handed. You then realize, this is a fucking fleshlight...