I'm a strong believer in tall trans handsome Boccher headcanon, this satiates my needs for that remarkably
About the out-of-character Bocchi tho, this author always drew Bocchi as more of a rizzler so it's nothing new from them but it is a tad bit jarring when it isn't just a single image but a long-form doujin. 6 years is a lot of time for someone to change and it's not THAT inconceivable that she would turn out this way but her character's essence is barely present and it doesn't feel like her most of the time. You could say it's a "what if" premise but when it gives this big of a drastic change to the character, idk... I go back and forth on this.
When you ignore all this tho, this was a cute read! I love Bohiro and I love tall Boccher