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You know drawing on some personal experiences and not trying to sound boastful but
You don't need any real Lez action for two women to be aroused. It's the situation that two women are involved in that can be arousing.
As an example:
Let's say Mr. Palmer has a girls' night out at a club and by accident Kendra and Anna run across Timothy and Dale. The story could start out innocent, with each girl taking turns just dancing with each of the guys. With each dance some flirting occurs and maybe a touch. Eventually both Kendra and Anna have a little make out session in a quiet booth in the club and switch guys.
As unlikely as there is to be any 3-somes in the game, but let's say there is. Kendra and Anna really don't have to do anything with each other, save for getting the other more aroused being more daring with whomever they are with.
However, and I've seen this far too often, one girl encouraging another to do something rather stupid. It's funny but another girl encouraging another girl is more dangerous than say a guy doing so.
It all goes back to myths and urban legends that women go bi in the above situations. But unlike popular male fantasies, women can be just as wild as men given certain situations. Am sure there are a few out there that have witnessed WTF moments at parties, gatherings, clubs and so on.
For the most part I don't think the story plots should go too deep in something that is rare and out of character for Anna. Would it really be possible that Timothy and Dale could corner Anna into something naughty? Yes... but! It can't be just some situation where it's too easy to defuse or simple. What would need to happen is for Anna vulnerable in a great moment of weakness and a once in a lifetime situation. It' couldn't be as pedestrian as the Chris shower scene, but it has to be more aggressive than the coffee break room but with a totally overwhelmed Anna getting involved in such a situation.