In my case, i did that a few more times and got the following to trigger:
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If you Turn the tables you become their dom and you can set rules for them and they get added as Romantic Partner even if you're already in a relationship with someone that isn't okay with sharing.
Took a number of attempts though, there's apparently a hidden 'control' stat and i consistently had her give me head instead after following her into the bathroom (also 3 Assertiveness btw) and filming it on her own phone like she intended to do with me.