Well it isn't, but in this work there is both yuri and futanari, and the yuri tag here isn't about the futa x girl, but about the two other girls where neither is a futa.
Leaving out the whole lolicon perverted stuff this manga reminded me of all the commonly known embarrassing and shameful things that you learn they are shameful not from parents/teacher but from your friends after you've been doing it for a long time which makes you feel far more uncomfortable.
There is Yuri on SAO in Mother Rosario arc, Yuki fall in love for Asuna and she explicity say that
So yeah, this doujin is pretty acurate about Yuki feeling for Asuna
Wait, what? If you are referring to that time Yuuki asked Asuna to marry her, it was a joke. They were visiting Yuuki's old home, that was supposed to be demolished, or something, so Asuna jokingly suggested that Yuuki should marry, and have that person protect the house. Yuuki laughed it off, saying that she did not have someone like that, and she followed this by making a mock proposal to Asuna.
In light novel when Yuuki "proposed" to Asuna, Asuna wasn't thinking that it was a joke or that she has a boyfriend, but she was thinking if gay marriage would be legal in Japan soon. So even if Yuuki didn't have any romantic feelings for her, Asuna propably did.
(Sorry for bad english)
