Characters - Sarah

I don't particularly appreciate incest.
Not that I find it immoral or anything, I'm just not crazy about it. I'm bored with the comics of the various big "adult 3D entertainment" sites, where a bored mom lying on her stomach on a bed gets fucked by her son while he smokes a cigarette.
Looking at the requests that come to me, if I had done incest comics I'd probably be rich now, but I wouldn't have taken a liking to them.
However, I decided to introduce a character who would follow that trend, but in my own way.
Michele has a sister who doesn't like boys. But she likes Lucia. I thought that she would gladly stay and watch her have sex, and that maybe she would let herself be dragged along.
I know that homosexuality doesn't work like that, but I hope I haven't offended anyone.
I thought of her as a girl with normal curves (for a change), who had a bit of that "I'm better than you" look. I had just seen one of the Harry Potter films, and in fact the character of Hermione was similar to the one I had in mind... So why not make her physically similar too? (I tried, at least).
I don't think we'll see her in the comic book anymore. For the above reasons she won't have a scene alone with her brother, and I don't see how to put her in a new chapter that could be interesting.
Any suggestions?
Oh, right. Here's your file.