The super excellent and intelligent sister, in preparation for her entrance exams to a prestigious university, dedicates all her time to studying! She has no time for romance, let alone masturbation, so her sexual desires keep building up. Such a sister calls me, her younger brother, into her room to serve as her sex release partner, using protected sex to vent her sexual frustrations and stress! But even during penetration, she's only focused on studying, feeling nothing and showing no reaction. It feels kind of lonely… so I secretly remove the condom and perform unprotected sex with ejaculation inside! As a result, my sister goes wild with pleasure from the real penis and becomes completely engrossed in sex!
