A community meme from Arknights. Originally an image featuring Ptilopsis (Arknights) hidden beneath the Doctor (Arknights)’s desk performing Stealth Fellatio while Blue Poison (Arknights) walks in to offer him Cake.
The original image (post #3815381) gained popularity on a Chinese social media site due to it avoiding deletion despite the site not allowing porn. The image consistently avoided deletion across many posts, including being used as video thumbnails. This caused it to become widespread and many memes and parodies have been made since.