I was assigned to train Rio Rukawa, an older new hire at the company. She speaks fluent Kansai dialect, has great communication skills, and above all, her big ass immediately catches your eye. As her mentor, I gradually found myself drawn to her kindness and cheerful personality. But I struggled with how to act around her—she was both a senior and a woman, after all. At work she used polite formal language, yet in our business trip hotel room she switched to casual speech, leaving me nervous and flustered every day. Then one time, half-jokingly, she asked, "Hey senpai, which do you like more—ass or tits?" Through conversations like this, our feelings for each other slowly began to grow. Rio teased, "You're not used to kissing, are ya?" as she drew closer. "Your cock's totally hard, ain't it?" Her eagerness was obvious. "Your dick's all wet and slimy from my drool," she whispered. "Make sure you watch good when my ass swallows up your cock." Our relationship kept getting more intimate, one bold move at a time.