Serina-chan，最好的性朋友，在肌肉训练和性爱方面都很健美。肌肉训练后，她做爱

``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 son started to react, so I asked Serina to see my son'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, the two head to Yakiniku, feeling horny.