I got an erection when I saw my childhood friend who helped me being fucked by a bully

Rin is my childhood friend who has always helped me when I'm bullied. He came to help me again today! But this time it's the other person's fault... I'm taking my place and becoming a lewd look! Now it's my turn to put all my courage into helping! Huh... I'm getting an erection. Even though my benefactor is having sex. ...I want to see more, cry more, get more done. Ah... what a great thing. I can't help but see how my beloved Rann looks like this... I just realized...I love how you're being raped lol Benefactor NTR! A scumbag erection!