【The Big Lie】masturbation class another story

The main character and Kaori have been dating for six months. When they are both first-time lovers and have a hard time initiating sex, they get a mysterious masturbator and dildo. This is a so-called wormhole-type item that can be [connected] to any partner’s genitals. At first, they frowned upon the idea, but once they tried it, the effects were obvious. The two of them became captivated by this adult product and became addicted to having wormhole sex everywhere. Then one day, they finally try to have sex in front of their classmates. An extra edition of the popular cathartic erotica [masturbation class] appears! What if it’s someone else who gets the mysterious masturbator? Such an “if" is finally realized!