MIAA-648 Natsu Tojo got an erection when he saw his childhood friend who was helping me being raped by a bully.

My childhood friend Natsu has always helped me when I was being bullied. He came to help me today too! But this time, the opponent was bad, and he got revenge and became lewd. Now it's my turn to muster up the courage and help! Um... I... have an erection. Even though my precious benefactor is being fucked. ...I want to see more, cry more. Ah...how awesome. I can't believe I get to see my favorite Natsu like this...