[This is a very out-there idea =.=]
Yuan Bing wakes up one morning to find himself lying in a hospital bed, with a fresh scar running across his wrist.
"You're the second young master the Yuan family adopted."
"You committed a terrible crime, then tried to kill yourself out of guilt."
"Also, you're... pregnant."
*
"I have a question."
"Ask away."
"What the hell did I do?"
"You kidnapped your little sister and raped your eldest brother."
"...!"
*
"I have another question."
"It's mine."
"W-what?"
"The child is mine. I'm your eldest brother."
"...!!"