It's too good to be true, but I wish it wasn't so at least in the manga's world, and they could maintain their relationship well, all the while the story follows the rest of the sisters' lives.
"My penis gets hard"
Instantly bursted out laughing during class.
That line wasn't (supposed to be) funny at all, just people may be used to hearing things like that in other contexts. While admittedly it could've been phrased better, it can be taken as a painfully honest statement that doesn't leave space for misunderstandings.
Since kashiwa has a girlfriend, shouldn't this now be tagged as yuri?
Kashiwa is not completely a girl at the moment, male parts still down there. (IIRC)
Gender can't be derived from sex or anatomy, that's what transsexuality is about (among others), however fully accepting that can be difficult while – even unconsciously – expecting them to be aligned. Completely – in that sense – she couldn't become anyway, without Sci-fi
or Fantasy
getting added to the tags.
Wow. Wait...does that mean that sex scene didn't involve penetration?
It didn't.