Today, I was able to enjoy a date with Mahiro-chan. As always, she was full of energy, and we met at the station. Despite the cold, she suggested we eat something warm, so we headed to a family restaurant. She listed off all the things she wanted to eat, "Yakiniku is good, pasta is good..." and while she was hesitant, she chose udon because she was on a diet. She made a fatherly comment, "Ah, it's so good it hurts" and I couldn't help but laugh. She told me she had gained weight recently because we often go out to eat together, but I wasn't too bothered since it was happiness-induced weight gain. We ended up finishing off a parfait too, and after leaving the family restaurant, we went to a park at night. We decided to get some exercise since we had eaten so much, so we played badminton. As a badminton club member, Mahiro-chan was agile and chased after the shuttlecock, and we sweated together. Under the pretext of taking a shower, we checked into a hotel. Mahiro-chan, still full of energy, attacked me as I lay on the bed! I thought it was just tickling, but before I knew it, she had undressed me and was playing with my nipples. "Your nipples are so hard and visible" she said, and she lavished attention on them with her fingers and tongue, getting my penis even harder. As a thank you, I gave her oral sex and fingered her vagina. "Is it okay if I insert it now?" she whispered, her face full of anticipation. Today, she was in the mood, and she took the initiative to straddle me and insert my penis. I was happy to see her actively moving her hips in both the cowgirl and rear positions, and I realized that she really enjoyed sex. I thrust my hips vigorously and ejaculated inside her. We were supposed to just take a shower, but things got heated, and we enjoyed each other from behind. Before continuing in the bedroom, I asked her to change into her athletic wear. She looked a bit surprised but changed into it without wearing underwear, and even showed me her practice swings. I surprised her with a gift - a vibrator wrapped in gold paper. She reacted with "What's this?" and we used it on her while she was still in her athletic wear, starting from her nipples and moving down to her vagina. She twisted and turned in pleasure, and it was incredibly erotic. We played a little bondage game, tying her hands with a towel and having her give me a blowjob. As I was reaching my limit, I inserted my penis into her in the missionary position (without a condom, of course). Her athletic wear added to the sense of taboo, and I thrust into her from the front and back. "You can cum inside me" she whispered, and I increased my speed, ejaculating copiously inside her. We both savored the happiness of the day.