It ended in a much better note than most "incest" works tend to end. I just was caught by surprise with the parents getting them going down there scene, it legitimate gave that chill through the spine and I thought "Oh Fuck!" to myself. Legit thought we could have had a very dark end if things played out differently at the end, but much respect for the author keeping it fluffy and positive throughout the course of the whole series, minus the Meiko scene that everyone hated. All things considered, this author earns my respect in not using the not blood related trope as a safe card, hell, or even the Oreimo route of the siblings going through the "just this one time, then back to being just siblings" phase, providing the readers with a bittersweet end.
I gave it a 7/10, I'm not into the taboo themes most of the time but the author made it enjoyable enough for me to bare with they being normal siblings and it knew what the manga wanted to be, no bullshit, no beating around the bush, the MC never went back after realising his feelings for his sister, and surprisingly enough the sister was the one who was always into him to begin with, being the reason why she went to an only girls school, which I find it dumb because cut short all possibilities of interacting with other boys of her age, and possibly falling in love with someone who wasn't her brother. I said once and I'll say it again, mad respect for the author getting to publish these, especially with some juicy scenes like the one where shit hit the fan.