My friend has sex with me aggressively

So, I'm kind of a lucky dude. My best friend has been trying to get my wife to fuck him for years. And finally, she gave in and let him bang her. It was like a dream come true for my buddy. But for me, it was a nightmare. I mean, my wife is hot, but she's not exactly a slutter. She's more of a good girl who likes to stick to one guy. But I guess she just got bored with me and wanted some action from another guy. Anyway, my buddy was all over her like a horny teenager. He was fucking her as hard as he could, making all kinds of weird noises. It was disgusting to watch. But the worst part was when she started to enjoy it. She's not supposed to get turned on by other guys, but I guess she did. She's a cheating whore.