You know what after I have uploaded the Nightmare Arc, I am re-reading these chapter many times.
When I was busy in drawing, I couldn't get the time to look at it due to work. It seems that Sumire's Ne-san's succubus' lure is too stong. How much tempting her violet negligee looks, How perfectly it suits with her skin. Sou is sitting with such a treasure. With such Allure Sumire can own anyone. Just How long the boy can keep distance of Her. When the girl loves him so much and it's not immoral to that world standard.
It feel quite the waste, that SFW versions can not be put in storyline. I will have them in extras.