I have the cutest little sister. Her name is "Riri." She's a third-year student at an all-girls school. While our parents were away on a trip, something happened that lead to a sexual relationship... "I'm happy to be able to spend every day with you, big brother... I'm happy to be able to have sex with my beloved big brother... It's okay... You can cum inside me... I want you to cum all over me, big brother..."