ひみつのセフレちゃん(出演：遊佐浩二、鈴木達央、立花慎之介、日野 聡)

DLsite

DLsite has an English site. If the page opens in Japanese, choose English in the “Select Language” prompt or the language menu at the top right. Its payment guide says cards issued outside Japan may not go through, and paying with DLsite points may be easier. DLsite payment guide · Buying Japanese audio works on DLsite from outside Japan