I liked this, I kinda see it as a relationship that holds a significance that surpasses just physical love. They were both wrecked by the death of their mom, and subsequent shattering of their family and both had to, at different times, become each others strength. Tomoe supporting Mikage growing up, and Mikage saving Tomoe from being trapped in the past. And they both ended up eloping and living together. (on one bed, doing only family-friendly things, obviously)
It is, admittedly, over-dramatic and choppy in some places, case in point Kujou's Slamjam, which could definitely use a bit more work. Right now i kinda see it as Kujou being a coward, scared of losing and scared of believing in love before she even tried, who tried to close it up and leave the whole issue as a scar on Tomoe rather than risking herself by trying for anything bigger.
Also while I'm here, for those who appreciated this kinda story, go read Ebisu and Hotei, It's like a more solid, less yandere-incest version of this.