Help! I Spoiled a Cthulhu Mythos Evil God Like a Little Brother, and Now He's Obsessed with Me

[Two male leads + dark, obsessive love that leaves no choice + unhinged tea-green top + brother-obsessed straight bottom + ensemble cast elements + Lovecraftian elements + one-on-one romance] Rainbow bubbles descend upon the entire world, bringing Lovecraftian corruption, and humanity awakens tentacle-based powers. Sa Jingchuan evolves golden tentacles, becoming someone even the upper ranks of the Tianshu Bureau fear. With his immense power, he declares: “First I'll protect one person, then I'll protect the world.” His good friend You Qingci is frail and sickly, and has no evolved abilities. If Sa doesn't protect him, he'll become a monster's food in no time. Sa Jingchuan: “My little brother is weak and has bad legs. Anyone who lays a hand on him, I'll wipe out.” The comments go wild: [I'm dying, Sa Sa really is blindly devoted. He's treating the ultimate boss like a pet cat.] [But seriously, doesn't he realize the You in You Qingci is also the You in Yog-Sothoth?] [Sa, wake up! The little brother you're raising just wants to get with you.] Sa Jingchuan looks at the comments: ... “Ridiculous! Qingci is Yog-Sothoth? Then I'm Azathoth! “And get with him? He's a man! Can these comments get any more absurd?” Until one day, countless rainbow tentacles fill the sky, blotting out the sun. Beneath that vast expanse of color, You Qingci points a finger, and all things perish. With a twisted smile, he says: “Divine Lord, big brother, don't you like this grand and romantic gift? Where do you think you're running off to?” Sa: “Huh?!” [Sa, your frail little brother can destroy the world with one finger. Here he comes. Still love him?] [Take people's advice and you'll have a full stomach. The straight guy won't listen, so let his brother have a full stomach.] The next moment! A giant hand pierces through the rainbow tentacles and descends from the depths of the universe. Sa Jingchuan's usual goofy look vanishes, and a faint golden light glimmers in his eyes: “Yog, which one of us should run away?” [Aaah! Fated push and pull, a showdown between two gods, the grand feast is here. Dinner's served!]