Mhh, is that the last chapter? I'm usually all for incest but this was the one time I hoped for Shinobu to win. Or for the threesome relationship.
Anyways, I liked the series despite the ending(?), but I kinda disliked this extra. Feels like your typical yuri porn written by some male dude - which is what it is, I guess. Obviously lesbians talk about sperm when having sex.