After the Green Tea Became Gojo's Younger Brother

[The blurb has been screenshotted] "You're so amazing, Brother. Unlike me, my cursed techniques are so lousy..." "You're so handsome, Brother. Unlike me, I'm nowhere near as good as you..." "Brother, Brother, your classmate is so scary~ Unlike me~ I only know how to feel sorry for you, mmph!" The young master of the Gojo family clapped a hand over Gojo Yue's mouth, his brow twitching. "Talk normally." "Oh." Gojo Yue fell silent for two seconds. "Brother, you covered my mouth. Geto-nii won't be ma~d~ about it, will he~?" "Ah!" Gojo Yue, flicked on the forehead, collapsed to the ground in a delicate heap. "Ah, that hurt~" Gojo Yue looks at dogs with soulful eyes and cries like the heroine of a Qiong Yao drama, JPG. Serious blurb: Gojo Yue was once the illegitimate youngest son of a wealthy family. To survive in the family, he honed his skills at acting like a sweet, harmless schemer. He never expected to transmigrate and become the twin younger brother of the Gojo clan's honored child. As the strongest man's twin, he can't lift a finger or carry a thing. He's the textbook definition of a useless sorcerer. Sticking to the excellent habits he'd developed in his previous life, Gojo Yue follows the young master around every day, calling him "Brother, Brother," with an "I'm fine" here and a "As long as you like me, that's all that matters" there. Before long, he's made himself the most important family member in Satoru's heart. But for some reason, everyone starts looking at Gojo Yue with more and more affection and sympathy. Gojo Yue: I'm acting like a schemer here. What on earth are you all thinking? Almost everyone thinks Gojo Yue can't lift a finger or carry a thing, but... Does Brother think so too? Gojo Yue silently reins in his power and keeps up his act as a sweet, fragile schemer. Sorry, everyone. My cursed technique isn't useless. Looking at the Special Grade curse staggering toward him, Gojo Yue's beautiful blue eyes gaze at it almost tenderly as he strokes every inch of its skin. "Would you die for me?" In an instant, the curse crumbles to dust. His cursed technique is called "Love." P.S. 1. Some OOC is inevitable. 2. This isn't a serious story, and it won't be meticulously researched. 3. I'll lightly torment Shrimp Oil and the others. Come experience the charm of a sweet schemer! 4. The male lead's frail body is due to JJK's twin setting. It won't affect his lifespan, and his cursed technique is powerful. (The sickly-but-powerful trope is the point.) 5. Pairing undecided. 6. Other characters will occasionally imagine things and feel sorry for the protagonist, but not often. 7. Primarily a crossover between Jujutsu Kaisen and Detective Conan, with Bungo Stray Dogs making a guest appearance. Theme: Love is a powerful force