Ek story dhundne me help chahiye

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Main ek story dhoondh raha hoon, lekin mujhe yaad nahi hai ki maine ise kahan padha tha.
Story line kuch is tarah hai:
Ek brother apni sister ke ghar aata hai. Uska husband tour par gaya hua hota hai.
Woh apni sister ke ghar par hi ruk jaata hai.
Dono jaldi hi bore hone lagte hain.
Tabhi use yaad aata hai ki agle hafte uski sister ka birthday aane wala hai.
Woh apni sister ke liye ek surprise plan karta hai.
Woh uske saath trip par jaane ka plan banata hai aur raat ke 12 baje cake laakar use surprise deta hai.
Uske birthday par woh uski saari wishes poori karta hai.
Aakhir mein, woh use apne saath sex karne ki permission de deti hai.