Doubt it, her libido isn’t nearly as high as fmc, her sister, and the teacher. After all we were shown that she started to care more about hanging out with her friends than sex so it’s obvious that she only enjoys it every once in a while with mc.
You could be right but I feel like author is too retarded to use his brain that much especially with how many holes and unresolved plot points there are in this manga but then again it is a satire manga so not much thought put into it