Apparently, in moving Atsushi's mother had landed herself a job as an office lady at Hoshizora Engineering. That was a pretty well-known company to Rin for a couple of reasons, one of which practically guaranteed their shared free time. "That's an interesting coincidence, Otou-san is a editor in one of the departments of that company. That is why he has a home office, to look over documents that go live outside of his work hours. But he definitely goes into work often so... we'd have a lot of time while they were working when we're not in school," she mentioned easily. Planning such an event was quite the task, but surely they could manage some amount of fun between themselves while their parents were working. Besides that they also had a shared room, though that would require more sneakiness, they could keep sharing it...
Ah, but those plans could be put off, for now at least. Rin was face to face with Atsushi and moving against him his arms taking place at her rear and squeezing just a bit. Such was fairly normal, but felt admittedly different in the setting of this tub. They were both quite relaxed and moving about in the water with relative ease, that little thrusting against her fore, did indeed make her want to do something. Ah, there was still one barrier which had to be addressed before such a thing was possible. Still, she found herself responding in kind, moving her own body against his. The water and the intimacy gave everything such a different feel. Even just a few words were quite tempting, she'd acknowledge the temptation by pulling back to look in his face, "Oh? Is it wise for you to be suggesting something like that Onii-chan?~" she questioned in a teasing manner. "It seems a bit questionable at best~" she stated. Well, thinking with his big brain might have been a bit hard, given how much of his blood was running through the thing pressed against her fore. They were on a test run, so many extra risks weren't at all necessary, still, there was a nagging thought that there was. She'd blame that on the danger, the freedom and being a bit pent up...