AQUCO-130 [VR] Is it abnormal that I get an erection even when my beloved girlfriend is tied up and playd by a stalker right in front of me? Mio Ichijo

The sweet time I was supposed to spend with my girlfriend instantly turns into a nightmare. I suddenly lose consciousness after being hit from behind... When I wake up, I find myself tied up and unable to move. And right before my eyes, my beloved girlfriend Mio is being raped by a stalker. I can't help her, I can't even make a sound... It's hell, just having to watch. She desperately resists, tears flowing in her eyes, and the words "I'm sorry... Please forgive me..."...