Cash Cobain served as a pioneer, ushering in the titillating subgenre of sexy drill, and Justin Bieber took note of the New York native’s ingenuity as the pop star recruited Cash for his SWAG album earlier in July.

On Tuesday (July 29), Rolling Stone caught up with the “Fisherrr” rapper, who detailed how his relationship with JB went from a DM showing him love to a collaboration.

“Everybody would just send me that sh–, so I just followed bro and I wrote, ‘Now we got to work. We got to get something in,’” Cash recalled after seeing Bieber post his “Trippin on a Yacht” track. “He was like, ‘All right, bet. Definitely got to do it, I f— with your sh–.’”

Cash pulled up on Bieber at his home and they got to work on a few ideas. “We had, like, a laptop, speakers and instruments in this circle,” he recalled. “We was just vibing and sh–. … That n—a’s a movie. He was just doing ideas. I never got to really see him really locked in, like, on some Justin Bieber sh–. I’m pretty sure that sh– will be fire.”

The rapper-producer continued to pepper Bieber with beats until landing on something they liked. “He’s swaggy. He’s been on the swag sh– for a little minute,” he added. “But we was talking regular sh–, too. We cool. He’d check on me like, ‘I’m just checking on you.’”

The week of SWAG, Cash Cobain heard back from JB that he was “going to try to get” one of their collabs on the album. “I’m like, ‘All right, bet.’ So I fixed it up and then the next day or the day after the next day, that sh– was out.”

“SWAG” ended up as track No. 18 on the album and also features Eddie Benjamin. The project debuted at No. 2 on the Billboard 200 with 163,000 album-equivalent units earned.