I know what they are doing is wrong. But I find it interesting because I find Cat and Lawson interesting people, and the fact that they are developing a relationship, even if it is cheating, is something I never guessed would have happened at the start of the series. I think Cat is a very insecure person who has a lot of body image issues and has tried to copy her twin sister's party animal image because she is tired of the bookworm persona she had been stuck in for so long. I think Lawson is also very insecure and very boganish but he is also very kind. Like one day he might be nice to you, but the next day he will be rude to you. They also like to put on a facade where everything is allright when it is actually not. Like in the power room Cat and Lawson were trying to keep it together, but afterwards you could see that they were both clearly devestated by what they saw.
Another part I find interesting is to see where it goes, especially in regards to outside the house. Will they try to make it work on the outside? Or will Lawson go back to his girlfriend while Cat goes back to Melbourne? I guess we will have to wait and see.
I also find it interesting because of the fact that they know what they are doing is wrong, but they did it anyway. The fact that they made some bad choices and now we have to see how they deal with those choices. I find that interesting.