@touchyou if really go into that sh.. of NTR I'll drop it too... I did some research and I was totally unable to found the raw of this manga anywhere but from my research something come out... putting aside two +18 doujin, all the other works don't have ntr as tag, if you just search in this site you'll see that the other 11 manga of Azuma Yuki don't have it too.
In a site I saw that this mangaka have 28 titles in her portfolio and then I saw this
Adult(13) Comedy(12) Seinen(12) School Life(11) Romance(10) Hentai(7) Ecchi(6) Harem(6) Shounen(5) Mature(4) Supernatural(3) Lolicon(3) Doujinshi(3) Slice of Life(3) Drama(2) Fantasy(1) Sports(1) Yuri(1) Shoujo Ai(1)
from the numbers you can see that she's comedy oriented and, after saw the ending of some of her work that are all happy ending, personally I come out with some theories:
- the experienced AV actress will help them, despite she say that she love sex she is gratefull to azusa's father so I don't think that she'll do something for hurt azusa or mamoru because that would be like betray azusa's father and what good they did for her.
- she'll try but him or her will stop the movie because can't bear the situation anymore.
- azusa and mamoru will do it together and become an amateur couple that will be called for do other movies.
- yuri between azusa and aria or even a 3some with mamoru e azusa with aria that jump in it
if you look in page 16 and read the title of the movie you'll understand the setting... starting from page 21 onward they clearly point on the word "couple" and in page 24 she clearly say "I don't mind as long as it's with you..." this basically mean that if another man try to touch her she'll refuse.
this are all my speculation and personally I hope in the option "azusa and mamoru will do it together and become an amateur couple that will be called for do other movies." but if a bad ending is on the horizon the drop of this series from me is sure