Being The 3rd Person... Need Help

I travel a lot, doing migrant farm work for small organic farms.
At the beginning of this summer, I ended up at a homestead with a married Lesbian couple. Things were going alright, but after a while Michelle decided the three of us should get a little freaky. So we're all together, I'm fingering her, giving her oral and whatnot. Then it's time to move on the her wife, Shannon. Michelle flips out and yells at me for touching her wife, because she belongs to her!
I was a little freaked out, and annoyed that I put so much effort into her getting off and she never even considered giving me anything back.
After a while, the situation comes up again. Shannon and I are both getting Michelle off, but we're not allowed to touch each other, and after Michelle is finished, it's time to wrap up and get to work.

Now, it's been a few months of this kind of thing. Michelle is happy as long as she's the center of everyone's attention. Everything has to be about her, and she makes everyone work really hard to please her. She has to get whatever she wants, and when she's done, it's time for me to leave, because I have to sleep in the shed on the other side of the property.

The problem is, I've fallen in love with Shannon. She says she loves me too, and she certainly acts like it. But Michelle flips out if she ever even sees us smile at each other. The only time we have together is when Michelle is out walking the dogs.
Shannon and I want to be together, but to Michelle, I'm not really part of the relationship. I'm just somebody who happens to be there sometimes. And Shannon always does exactly what Michelle wants her to. Michelle is the only one whose voice matters. And Shannon wouldn't ruffle any feathers anyway, because her marriage is the most important thing to her. She lives to make Michelle happy.

So I'm caught in this weird situation. I can't leave, because I love Shannon. But Michelle doesn't want me to be in their relationship. She wants to keep me around, but just to be convenient sometimes.

I'm trying to be Michelle's friend, to become closer with her so maybe she'll see things differently. But she is the most unemotional person I've ever known, and she doesn't respond to anything. You can give her an orgasm, and the next minute she'll be yelling at you. Shannon seems to thrive on this kind of abuse.

I don't know what to do. If I just shut down and accept that I don't mean anything, it hurts Shannon, who I know loves me. But I can't even openly talk to Shannon without Michelle starting a fight about it.

If anybody has any insight, I would be very thankful to get it...

 

Doesn't seem like this could ever work in your favor. I'd say as much as it hurts,it's time to move on. Now if it was me,I'd just disappear and start over someplace else. But that's me. Probably not helpful,but some situations are just too complicated and stressfull to keep butting your head up against. I have the idea that there are quite a few other women out there among us.