My junior coworker at the part-time job was feeling down because her boyfriend was about to dump her, and she was at rock bottom in life. The reason was that she couldn't satisfy him due to a lack of sexual technique. Not wanting to break up at all, she ended up asking me, her reliable senior, to practice with her!? She begged me, "Please lend me your dick, senpai...///" This is just practice, so it's not cheating! Insisting on that, my desperate junior coworker frantically licked my dick sloppily to grab her last chance. She asked, "Senpai, how is it~? Does it feel good~? ///" Her usually unseen, overly lewd service face made me unable to hold back, and my dick was about to explode. If her boyfriend can't be satisfied with this, he's way too spoiled. It was a super lucky day when I even got to creampie her during a break at work as practice.