Is it normal for my stepdaughter to come and sleep in my bed with me.

My emotions started one summer when I was staying at my uncles. I came into the living room to watch tv. The room was cool he was on the sofa with a blanket on. I then notice there was something going on under the blanket. Turns out it was my cousin under them giving him a blow job. It wasn't three days later I was giving him BJ's and my cousin and him had sex daily.