Story idea (Patreon)

Hi all, I came up with a quick story idea. While I don't want to spoil too much, I'm stuck between two variants of the same plot. Perhaps you have some ideas and would like to give me some feedback on it the story.

Basic story outline:   A young, innocent woman joins a gym, where she is befriended by an older, experienced, heavily juicing pro bodybuilder. Either a cocky male who chats her up wanting to get in her pants, or an older female competitor looking for adoration. The pro offers to help with the youngster's training and takes her under the wing.
The young woman however appears to have a seemingly superhuman talent for putting on mass. Soon the older pro grows jealous, and after the young woman rejects their advances, grows resentful. This leads to attempts at both sabotaging the young woman's training, as well as unhealthy gear use and insane training, which ultimately leads to either injury or some other negative consequence. I haven't totally come up with an ending yet, it could either be a redemption arc or doing something really bad (open for suggestions).

Which variant do you find more interesting?