For me, it's a combination of things. I like the pose and the fact that it isn't Naruto...but also the expressiveness of the eyes. Looking at MCed, bound boys gets tiresome after a few dozen until I get back into that sort of thing again.
I think it's a collab in the best sense... Footcuff's linearts (especially expressions) are super cute, yet his shading is often basic. Your shading of this is awesome, so you elevated what was a cute subject in an interesting situation to something I spent a minute staring at, wishing I could reach into my screen and steal him.