[S4E3] GOT...Why did Jaime do that 🥲

I on season 4 of GOT and after Jeffrey's Death when Jaime came to sansa I didn't expected him to forcefully fucks her right below her Son's dead body. (Actually its his son too).

I didn't get the need of that scene as I just started to like Jaime after all what he has suffered in S3.

What are your thoughts was that necessary...