The era has shifted from Heisei to ○○, and the country's low birth rate is progressing further, making sperm a precious resource. Soon, even classes that squeeze out every last drop of precious sperm from deep within the testicles were introduced. Female students hollow their cheeks and tighten around the penis, sucking up sperm from the urethra, honing their vacuum fellatio techniques. Serious vacuum fellatio turns beautiful girls into grinning faces. This is a story of female students passionate about vacuum fellatio.
