My beloved girlfriend... Nana. I really wanted to be affectionate with her, but she got angry, saying, "Why do guys only think about sex?" I need to make up with her and apologize... After the school festival, I was supposed to meet her, but instead I saw Nana being carried on the back of our teacher—and something felt off. No way, this can't be happening... "You're just... really good at sex, aren't you, sensei?" In terms of experience, technique, and tenderness, I was utterly defeated. In this painful reality, my erection won't go away during these after-school NTR moments. What should I do now to strengthen my bond with her?