Nodding along as Ilsa spoke would be the cue Fen used to display she was still listening. Ilsa tended to be one that didn't need a lot of care taking, seemed like she could handle shit on her own, which was exactly why Fen minded her less than a lot of others. Hell, it might even border on liking Ilsa, which was no small feat when it came to Fen.
"Am a fan of not sweating my ass off." Fen joked back lightly while she checked the device. Everything seemed to be running smoothly, the timer was set to adjust as the weather shifted throughout the day or to spike up for any hot yoga sessions that may have been scheduled appropriately. When finished playing with the button's she'd turn back looking over at Ilsa.