An older sister who was bullied at school was forced into incestuous relations with her younger brother (HUNBL-133)

One day, my ordinary older sister brought home a rare friend from school... However, this friend was the girl who bullied my sister. When I entered my sister's room, this friend jokingly forced me to lose my virginity! Then, one by one, other friends sexually assaulted me... I became their sex toy. My sister's malicious friend wanted to see me have sex with her... Although my sister and I resisted, we ultimately couldn't resist and she forced herself on me... Finally, she even demanded forbidden penetration! I'm mentally broken...