This image is unavailable on Donmai. Go to Danbooru or disable safe mode to view (learn more).
Artist's commentary
What do you use when you're alone?
Rei: When I inadvertently used the yin-yang orbs I got from Yukari, it felt awful.
Ma: Got overheard, huh...? My condolences. Lockin' the door's the basic first step, though.
Sa: It's scary, all right. When I think that I might be seen by Kanako-sama and Suwako-sama...
F: You get turned on even more, huh!
Sa: I do not!
F: Sis, what do you do if Sakuya sees you?
Re: Even if she's watching, I feign ignorance. Actually...well, Patche?
Pa: She just stayed expressionless and left the tea.
A: It must be tough with a lot of people under one roof.
Girl Talk (advanced volume)
Well, it might not be like that.
I actually wanted to post this yesterday, but figured I'd do so only at the posting time, at least.