I can't remember there being a 20 minute lesbian scene tbh, and the kid getting breast fed was to show how mentally messed up Lysa Arryn was and is part of the book.
It was season 2 I believe an early episode maybe. Little finger was watching them. I'm probably just exaggerating, I was just mortified because I was in college and living at my moms at the time.
My brother walked in my room and was just like wtf are you watching? Lol I kept thinking it would end and it would go on and on.