Holy shit, what happened in this thread lol. Did not expect a 68 post discussion on a simple oneshot.
Not to criticise anybody but I think some yuri fans are too uptight and pre-emptively negative. Doing things like automatically assuming a bad ending or categorizing more natural, realistic stories as porn.
This oneshot certainly isn't particularly romantic but it is hardly trashy (nor unfriendly towards 'real' yuri). I'm actually pretty fond of the ending. Towards the start of the story Kiwa talks about how Ririka's current personality is 'boring'; i.e. conservative dress, learning to cook for her (to-be) husband, basically preparing to turn into a housewife who stays at home to look after the kids. That's in contrast to her highschool personality, which had a bit of a wild, out there, mature charm. What I totally love about the ending is just how the body language and expressions show that wild side coming out of Ririka again, show Kiwa triggering it through her advance on Ririka. While on some levels this is a bit problematic from a 'pure', 'romantic' yuri perspective (the fact that Kiwa is clearly playing up her adult, stylish appearance, and seems to be appealing to Kiwa's 'naughty' side), it's pretty engaging on the simple 'get the girl' level (and also maybe on the 'ntr the boring fiance who just wants a docile, domestic trophy wife' level). The point is that it's completely clear that Kiwa's in a position to sweep Ririka out of that marriage, the remaining question is whether they can transition after that into a stable, normal, loving relationship (for which, ultimately, I think the answer is: for damned sure).