Is it wrong to get laid with step mother?

A week ago I got a phone call from one of my best friends, Nino. He said: "Yo dawg, we're going to your house!". "Yes sure, I will right there on 30 minutes. I'm still in the office" I replied. "Say what?! Hey, it's Saturday! No one works on Saturday!", he argued. "Not me dawg! I got to do my job since yesterday I took off." I explained. "Ok then, see you soon!" he closed the phone. Then, at my house (as usual) we chatted, laughed, discussed until the time showed 6.30 pm. As the ordinary guys who live in the ordinary world, realized that we are sinners (just kidding ^^), we went to the mosque to do the worship things. But, on the middle of the road, only 100 meters before we arrived at the holly place, we did something that we shouldn't do! I knew it was a coincidence and we never expected to do that. But as the normal human being, we couldn't pretend. We saw Shiro screwing his step mother; Blacky. I didn't know what those creatures were thinking of. They fool around in the public space. I just wandering; did they care about morality or thought that it might be a sin? hahaha.... Silly question ^^! Wait! Wait! Wait! You don't think that they are people, do you? No! They aren't homo sapients! They are Canis lupus familiaris. Gosh! You know what?! You should brush your brain ^^!