Iogi and Shirasaka's relationship is really messy. That's what would happen when you don't communicate your feelings.
While most readers love Iogi and sympathized with him, I don't. He reaped what he sowed. He's sooo selfish, a bastard that only cared for his own happiness and to achieve that, he blackmailed Shirasaka repeatedly, exploited Shirasaka's guilt towards him so that Shirasaka won't leave him, hurting (mentally, not physically) Shirasaka continuously to the point that Shirasaka almost kill himself! Can someone tell me what's so good about Iogi?! It was his own fault because he didn't want to confess his love in the first place, before the accident happened and even after the accident he never told Shirasaka the truth, he only assumed and assumed in his head. In his POV in doujinshi, he told readers that was because he didn't want sympathy from Shirasaka if he confess. Ookay, so he didn't want sympathy, but he wanted his body, the heart will follow afterwards, so why not bind him physically, right? He didn't even think twice when it was for his own benefit and happiness, he never considered Shirasaka's feelings at all.
So that's why I'm truly glad that Shirasaka ended up with Tamiya instead. And I love Tamiya's personalities.