Idk man they dont really have much something going on even in the main story their interaction is just like sacha babysitting. For now they're like unseasoned chicken, 4 years together and still have the same babysitting interaction? Or maybe there's something happening behind the scenes? Or sacha is just really slow and emotionless bc he's alien so he's processing emotions a bit difficult than human? For me i kind of don't like stone face emotionless seme, or maybe he's the bottom? Lol