KTRA-343 Riina Asuka teases her big-breasted sister

[First production bonus] “Letter from my sister” included *Discontinued while supplies last. - My younger sister ``Riina'' is a normal girl with plain eyes. - Except that her breasts are huge... - Adolescent Riina has a complex about her big breasts. - I'm always concerned about how the boys in my class look at me, and I suffer from stiff shoulders... - For the sake of my cute little sister who has so many worries, I, the big brother, decided to take a step back! - ! - First, I rub her shoulders, and her big breasts, which have grown up before I knew it, sway and tempt me! - ! - My reason for having a big boobs fetish is completely destroyed! - ! - I forgot that the other person was my sister and my dick became swollen...! - ! - "Riina, I'm going to teach you what feels even better, big brother..."