I had the fortune of finding this on my 2nd play through, early on.
Missed it on my 100% file, it can be found right after Trevor's first LS heist.....
Trevor talking to Mr. Raspberry Jam:
"(Listens) Hehehehe, you are a naughty bear Mr.Jam"
"Aren't you a trooper? Aren't ya?"
"Koochy- koochy-koooo"
"Friends Forever"
"Mmm, How could I say no to you, heh?"
"(laughing quietly), hehehe, if you wanna do that we're gonna need a safe word....."
"mucky nose, naughty"
"Mmm Look at you, mmm."
"(cough) uh, I am vanilla by your standards"
"Hmmm? Oh you have the filthiest mouth, you know that!
"Mmmm, you'll keep our secret...."