Definitely not. Fanfic should generally focus on positive and respectful interpretations of a character or a person's work. Sexual fanfic about Alison Brie crosses the line into inappropriate and unethical territory. It can also make the actress uncomfortable and is not in line with proper fan behavior.
Love is a very common theme. Since their relationship has a strong romantic element, fanfictions often explore different aspects of their love, like first love or rekindled love. Another theme is friendship, as they were friends before becoming more. And then there's the theme of acceptance, especially in terms of their relationship within their community.
Alison Botha might be someone who has a unique story, perhaps related to her personal achievements, struggles, or contributions in her community. However, without additional information, it's difficult to provide a comprehensive account of her story. It could be that she has overcome obstacles in her life, like an illness or difficult family situation, and has made a name for herself through perseverance.