[survive] All my friends' sisters are perverts! Motion Comic Edition

Overview： One day when I went to my friend's house to play,I peeked at my friend's sister changing clothes and taking a bath. I realized that it was wrong and ran away immediately,but my friend's sister knew everything... "What should I do? Will I just go home and masturbate myself? Or..." Natsumi gave me a good wank while my friend was away... She even had sex with me happily,so she was just as perverted as she looked...! From that day on,I got hard every time I met my friend's sister. Even his classmate's sister found out about his erection... "My penis got so big from looking at my underwear and my sister's... I wonder what she'll think if I tell her..." "She peeks at me while I change and take a bath... I can't take it anymore..." "Don't get so erect next to me,my tutor... I need to concentrate..." "My brother and parents aren't here today... so it'll be just the two of us until the evening..." "Don't move when I'm cutting your hair... does it itch anywhere...?" "Today is your birthday... so let's make a cake of you and celebrate together." My... older sister is so naughty...! Makoto,the main character,is an only child and can't help but be jealous of his friend who has an older sister. His friend's older sister is several times cuter and sexier than other girls,and his desire for an "older sister" just keeps growing. Makoto is a defenseless boy who is quiet,obedient and submissive,and gets hard as soon as he sees something erotic. He is targeted by older sisters who are lonely because their younger brothers have left them,and older sisters who only have younger sisters and want a younger brother. Makoto is teased by these sisters who are more naughty than he ever imagined.