Kanye and Kim
Kanye West and Kim KardashianReuters

Kim Kardashian is reportedly furious over Kanye West's alleged crush on her sister Kourtney Kardashian. This comes after the 41-year-old rapper stated he would have sex with his wife's sisters - Kourtney Kardashian, Khloe Kardashian, Kendall Jenner and Kylie Jenner - in his new song XTCY.

In the new track, he raps: "You got sick thoughts? / I got more of 'em / You got a sister-in-law you would smash? / I got four of them / Damn, those is your sisters / You did something unholy to them pictures / Damn, you need to be locked up / Nah, we need a bigger hot tub."

According to NW, the 37-year-old entrepreneur is unhappy with her husband's thoughts and feelings for her elder sister. A source said: "Kanye hangs off Kourt's every word and is always telling Kim how hot he thinks Kourt is. They've gotten closer lately because Kourt's been asking for his advice on business stuff. Ye's also given her a key role in his sneaker empire."

BIRTHDAY BEHAVIOR! WERE ALL TURNING 21!!

A post shared by Kylie (@kyliejenner) on

"But it's so not cool for Kim seeing her husband drooling over her big sister, especially when he's not exactly subtle about it," the insider added.

The father-of-three had previously revealed that he had a soft spot for Kourtney, sometime before he tied the knot to Kim.  Back in 2008, West had a blog called Kanye UniverCity and in 2009 he named Kourtney one of his "Girls of the Week."

Family Over Everything! #OurCalvins

A post shared by Kim Kardashian West (@kimkardashian) on

"Even though Kanye's not Kourt's type at all, the principle of him hitting on her older sister is something she finds gross," the source revealed.

Meanwhile, the 39-year-old reality star had previously admitted that she takes fashion advice from her brother-in-law. She told People: "He's not shy about giving advice. He'll say, 'Look, I love this, I like that.'"

"I remember I was going to Paris for Fashion Week in the fall and I was showing him my looks. I had photos of the outfits I was going to wear and he had me switch a couple things," she added. "I remember he was like, 'Get those Dickies and wear Dickies instead.' I can't remember what pants I was going to wear. I don't even know if it was jeans or something and he was like, 'Get Dickies and wear those.' So now I got a bunch of Dickies after he said that."

Adding on, she revealed West has also styled her and Kim together in matching outfits for some appearances at Paris Fashion Week in September 2016. Kourtney continued: "I remember another time in Paris when we were all there together, we were getting ready together and he fully dressed Kim and I. We were in these Balmain outfits, like gold and silver. We were going to a Balmain after-party and he fully dressed us from head-to-toe together. He wanted us coordinating and he definitely had a vision."