The plot is about a virgin guy, using a sex toy and calling the customer service about it, falling for and jerking off to the guy's voice.

He recognizes him later and they start a no strings attached relationship, until the office worker realizes that he just took his virginity in a hotel and feels kinda sorry for him, so they do it again but properly. The protagonist works in a bar and has a best friend who is in love with him for ages, but keeps it a secret and wants to confess if he wins in some sort of sport tournament.

I am 98% sure that it was full color, but I could be wrong.

Sorry for the bad description.
I'm thankful to whoever helps me find this.

Edit: Nevermind, 6 min after posting it, I managed to find it. It's called TALK TO ME TENDERLY.

I'm happy for you. I also will read it. Thanks for replying with the answer 🙂