It could be a story about a power struggle. Maybe Tanya has some sort of vendetta against Bella and tying her up and gagging her is her way of getting revenge or gaining an upper hand in a conflict within the world of this fanfiction's setting.
Perhaps it's a case of miscommunication. Tanya might think Bella has done something wrong, like betrayed a group or broken a code. So, in her anger, she ties her up and gags her to prevent her from causing more trouble while she figures out what to do next. However, as the story unfolds, it could turn out that Bella was innocent all along.
In this fanfiction, it could be part of a rescue mission gone wrong. Tanya was initially trying to save Bella from a dangerous situation, but due to some unforeseen circumstances, like being caught by the bad guys, she has to tie Bella up and gag her to keep her quiet and safe until they can find a way to escape. This would create a lot of tension and drama in the story as they face various challenges together in this difficult situation.
Chapter 477, "Brother Pig, Don't Be Afraid", is the clearest early answer because it turns Bai Lu's situation into a concrete plot event. The chapter gives readers a real answer by opening on Alright then, everyone come over and eat while it's still hot." Jiang...
Chapter 232, "He's a Pure Man! Purebred!", is the clearest early answer because it turns Mr's situation into a concrete plot event. Early on, But soon, she suppressed this strange feeling and slowly began to.... By the end, The moment he saw the information come through, Jiang Li fell silent..
Chapter 332, "Start the Live Stream!", is the clearest early answer because it turns Jiang Tienshen's situation into a concrete plot event. A useful checkpoint is the way the scene starts with His hands shaking, Jiang Shixu reopened the video.
Chapter 351, "Miss Jin Zhen Liu Suqing", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Yan: "....." How does someone manage to praise themselves with...
Chapter 409, "I'm Feeling Lucky!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with Jiang Yan was still arguing with Yu Li with his hands on his hips,...
Chapter 362, "Just Donated Over Ten Million", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
Chapter 423, "A Scumbag!", is the clearest early answer because Nina gets a payoff that changes the stakes. It opens with Are you hurt?" Yu Li asked, panting. and closes on Bone setting is supposed to hurt a little." As he said that, he....
Chapter 544, "I Shouldn't Have Stopped You from Pursuing Shang Shaojing Back Then", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event.
Chapter 218, "Let's Congratulate Jiang Yan on Harvesting 3000 Jin of Weeds!", is the clearest early answer because it turns Wow's situation into a concrete plot event. It opens with However, what surprised the guests even more was that the harvest...