These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Brass Restoration
Ho Yay - Ryo/Koutarou. Not a possible route, alas.
In the Yukine route Ryo thinks Tsubomi is about to kiss him so you get the choice who he should think about because kissing Tsubomi is wrong (in his mind), Koutarou is an option. He pounces on Ryo, strips naked and Ryo fails to fight him off... then Ryo wakes up. Later Koutarou asks Ryo who he's interested in and you have the option to declare love to him, which causes him to go into shock and collapse.