Is it normal that i had sex with my friends mom

ok so i was staying the night at my friends house with him and his mom. (shes divorced by the way) and we had just got done playing some 360 and was putting on a movie to watch while we went to sleep. well when his mom went and changed into her night gown. I had noticed that she had no bra or panties on. So i just figured thats how she likes to sleep. so by now my friends dosing off and im watching the movie and we are laying infront of her bed on the floor (shes lives in a very small apartment). so the movies getting close to the end and im starting to dose off and I feel her tap the back of my head with her toe so i turn around and look and she askes me if I want to have a smoke with her in the bathroom. so I said yes and we proceded to the bathroom. She closed the door behind us and opened the window and we stood beside it while we were smoking. It was cold outside and it was started to make the room cold and I noticed that her nipples were getting hard and showing through her gown. so i was trying my hardest not to look but couldnt help it. Still smoking my cig she askes me if i mind if she pees with me in there. so i said no and she lifted up her gown and started peeing and as she was lifting up her gown i took a quick peek over and saw her ass as she was sitting down. so now i got a stiffy and im
trying to hide it. so she finishs and said it was okay to look and when i turned around she was butt naked. it took my breath away and i was speechless. so she walked over to me and started kissing me and slowly starts taking off my shirt and undoing my jeans. Before long im butt naked and shes stroking me telling me to get in the shower. so I got in with her and we start washing each other and she dropped the body wash(I think on purpose) and bent over to get it well I wasnt gonna let it pass me up so I stuck her and went to town untill the water tuned cold then we got out of the shower still dripping wet and started on the floor. she started to moan louder and louder and i was putting my hand over her mouth so she wouldnt wake my friend. Then she cumed on me almost screaming now she burrys her head into my cheast as i keep going making her cum more and more. after im done for going at it like 3 hours she sucks me clean then tells me that no one has ever made her cum before and now she wants me to come over every night. what do I do I dont want my friend finding out becuase he will try and kill me but I want to go back and do it with his mom.. is that Wrong?? am i a bad person???