I'm not sure specifically which 'issei' you are referring to in the light novels. There are many characters named Issei in different works. Without more context, it's difficult to determine if this character has such interactions in the light novels.
I'm not entirely sure as the description is rather unclear. It could potentially be about a character named Issei in the 'DxD' universe and some sort of action related to a fanfiction about him. Maybe it's about exploring or creating a fan - made story where Issei is involved in a stroking action, though without more context it's hard to be specific.
No, it is not appropriate. Such content involves vulgar and inappropriate sexual themes, which go against moral and ethical standards in most cases. Fanfiction should focus on positive aspects such as character development, friendship, and adventure rather than such improper content.
It could be his fellow team members. They might betray him out of greed for power. Maybe they thought that by getting rid of Issei, they could gain more resources or a higher position within their group.
Issei could react with anger. He might lash out at his partner and the person they cheated with. He could also become very confrontational, demanding explanations and apologies.
There are many great Issei - related fanfictions that focus on his adventures, growth, and relationships in a positive and appropriate way. For example, some fanfictions might explore his training with his comrades, his efforts to protect the people he cares about in the face of new threats. These types of fanfictions can be found on popular fanfiction platforms by simply searching for keywords like 'Issei positive development' or 'Issei adventure' and then filtering through the results to find the ones that suit your taste.
Rias could be a main character. She has a strong connection with Issei and in a fanfiction about him as the Prince of Darkness, she might play a role in helping him control his new power or deal with the political ramifications of his new status.
Issei could develop by learning the discipline and self - control that comes with being an exorcist. This would contrast with his more impulsive devil - side nature. For example, he might have to resist the urge to use brute force and instead use the more strategic and spiritual techniques of an exorcist.
In many Issei in the Darkness fanfictions, Issei often undergoes character development. He might face new challenges that are different from the original story. For example, his relationships with other characters can be re - defined. He could form stronger bonds with some characters while having more complex rivalries with others. This makes the fanfiction interesting as it gives a fresh perspective on the character.
To determine if an 'issei' has cheated on fanfiction, we would need to look at the specific fanfiction in question. Different fanfictions have different storylines and character developments. Maybe in some very niche or specific fanfiction, there could be a situation where an issei - like character is involved in cheating, but it's not a common or known occurrence in general fanfiction.