The ending point of the Tomo-chan anime in the manga can be a bit tricky to determine. Sometimes, the anime might condense or expand certain storylines compared to the manga. You might need to do a detailed comparison to figure it out precisely.
I don't know for sure who Tomo is in this context. It could be the name of a person who is the translator or the founder of the translation project related to these novels.
Well, if Sasuke finds out Naruto is a girl in fanfiction, it could completely change their dynamic. Maybe Sasuke would start to see Naruto in a new light, perhaps more protectively. Their relationship might become more romantic as Sasuke realizes his feelings for Naruto are different from what he thought. It could also lead to some interesting plot twists, like Sasuke having to re - evaluate his rivalry with Naruto.
One common reaction is anger. The boy might feel betrayed and lash out immediately. He could yell at the girl or even break things in a fit of rage. Another reaction could be sadness. He might feel deeply hurt and start to question his self - worth. He could withdraw from social activities and become very quiet. Sometimes, the boy may also feel a sense of relief. If he had suspicions before, finding out the truth could end the uncertainty, although it's still a painful discovery.