It's not okay. Such content can make people uncomfortable and can have a negative impact on the overall image of the fan community. Fan fiction should focus on positive aspects like character development, new storylines within the boundaries of propriety, rather than delving into erotic themes.
Rather than erotic fan fiction, you can create a fan fiction about Enji's past. Explore his childhood, his family relationships, and how those experiences shaped him into the character he is today. You could also write a fan fiction that focuses on his career or his role in the fictional world, highlighting his achievements, his failures, and how he overcomes obstacles in his professional life.
His friends would probably take care of him. Midoriya would be very eager to help, using his kind-hearted nature. He would make sure Todoroki is fed and comfortable.
Crying could be described according to different situations and characters. There were a few possible ways to describe it:
1. Crying sadly: The eyes are red and swollen, and the tears are constantly flowing. The lips are slightly opened, as if they are silently pouring out the pain in their hearts.
2. Crying in despair: Tears poured out like a waterfall. His eyes were hazy and he looked depressed as if he had lost all his strength.
3. Crying angrily: The eyes are red and swollen, and the tears are like boiling flames. The expression on the face also becomes angry and resentful.
4. Crying in surprise: Tears instantly gushed out of her eyes as if expressing her inner ecstasy and gratitude.
5. Crying in fear: Tears flow from the eyes. The trembling body and helpless heart make people feel fear and uneasiness in their hearts.
Different crying forms could show the character's inner emotions and personality characteristics, and at the same time, it could allow the reader to better understand the character's psychological state.
One common theme is redemption. Since Enji has made mistakes in the past, many fanfictions focus on him trying to redeem himself in Rei's eyes and in the eyes of their family. For example, he might take steps to be more understanding and less controlling.