Man this is a lot of reading. It's hard keeping up when doing lawn work.
While I am team Fumi, all the talking with
@diphuc1 did make me see possibilities with Sakura despite what she's done. Granted I at least want Shinobu to bag Fumi even if just once so that he and Sakura are even in terms of "body count" that we know.
Here's what I'm thinking with Sakura. She could very well be in a "relationship" with Yuma. But that's all it could be. "Relationship". There's the possibility it's an empty one and that Sakura is in it just cause she was pressured to.
Yuma could be trying to make Sakura happy like he told Shinobu but it's not just working. Sakura could very well be satisfied physically, hence still having sex but she isn't the one initiating it (that we know). Yet still lacking the emotional aspect to it. The part that reminds her of Shinobu. She very well could not see him or even try to because she also feels guilt with what happened that night and so she's ashamed.
We know Shinobu doesn't contact her because despite what she's done. He's selfless even now when it comes to Sakura seeing success. He's genuinely wanting that for her as he said to Fumi during this chapter.
Sakura may not be contacting him because the post nut clarity hit her in the morning. She realizes what's happened. I wouldn't be surprised if she suspects there was a misunderstanding. After all this isn't the first time. So she can't bring herself to face him.