Help me find a doujinshi

I didn't really read it here in mangago but instead in MRM(if ykyk) but I can't make an account there so I'll just ask here, does anyone know a hetalia dj where the theme was like in outerspace? I vividly remember that one of the main couple died and turned into like a robot(?) and the reason why that person died is because seme or the uke got too close to the supernova?? I DONT KNOW I FEEL LIKE IM GOING CRAZY, I think it was pretty tragic and it's one of the doujins i read that genuinely made me change my perspective in life I remember crying about it too because the one who lived was yearning about the one that died