Get you what mean,but I quite respect the author of the two stories quite heavily because it’s one of the few stories where it uses the actual cast from the Kamen Rider shows,no ocs replacing main rider,just Sougo Tokiwa and Ruby Rose hanging out being siblings from different worlds,The Symphogear girls going to Touma’s bookshop along with the other sword riders,etc.
They both even contain “filler” type mini chapters where it’s just the cast goofing off and relaxing together(some of my favourite were Desast visits Chris Yukine and become best friends and Zio cast training in Atlas training room).
The part where Touma is Hibiki and Miku’s wingman,I may exaggerated that part a lot. Hibiki and Miku are not actively pursuing each other yet at where the story is as of now since romance is not the main focus,but the tags in the AO3 shows Hibiki/Miku in the relationship tags so…
But anyways,Touma is just the best friend to them,no romantic interest with so ever,there’s some other shipping in there in both stories that will surprise you.