Old Man, Hand Over the Semen!

University researcher Maki Nazumi collects semen from middle-aged men under the guise of research. After milking a junior and another middle-aged man, she visits 56-year-old hikikomori Kutao naked, seduces him, and extracts his semen through oral and vaginal sex with multiple creampies. Later a muscular dark-skinned man arrives at her door declaring he came to impregnate her; he roughly penetrates and creampies her while demanding she become pregnant and his girlfriend. She accepts, and he orders her to quit university and live in his house forever with daily sex. She happily notes that this ends her research slump.