Serina-chan, the best sex friend who is stoic in both muscle training and sex. After muscle training, she has sex with a sex fri

``Serina'' was in the swimming club together at university. Even after graduation, we still meet up occasionally and work out together (sex friends). This time too, we went to the gym (reserved) to work up a sweat together and started working out together! A slender body with muscles and a well-trained, plump, beautiful ass...In the space where we were alone, I was watching Serina's extremely sexy muscle training, and my stepson started to react, so I asked Serina to see my stepson's erection. He asks her to touch him and engage in fornication. Even though it was just the two of us, I was refused because it was impossible in a public place (laughing). After finishing their workout feeling horny, the two head to Yakiniku as it's a cheat day.