Episode 4.21 "The Agreement Dissection" has Priya using her legal skills to nullify Leonard and Sheldon's Roommate Agreement. Sheldon gets his revenge when he makes Leonard sign a new Roommate Agreement to stop Sheldon telling Priya and Raj's parents about Priya's relationship with Leonard. What if Priya and Leonard call Sheldon's bluff?

Part 8. Last day before departure.

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The day before departure Leonard went into Caltech to check that everything was OK in his lab, his assistants would run the lab for him whilst he was India but they would do some experiments suggested by Leonard's Indian researches. Just before he left he went to see Professor Gablehauser who wished him well for his travels and told him some funny tales of his student days with Professor Malik.

Gablehauser: So have a good trip Dr. Hofstadter.

Leonard: Thank you for helping to arrange this Professor.

Gablehauser: I know that you have your personal reasons for this but it will be a good scientific opportunity for you and for Caltech. Prakash Malik is a good man, you should learn a lot from him.

Leonard: I am looking forward to it.

Gablehauser: I am sure you will, please keep in touch and have a good trip.

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That night Leonard and Priya, Howard and Bernadette, Sheldon and Amy and Raj and Penny all went out together for a farewell meal at the finest Indian restaurant in Pasadena. At the end of the meal both Priya and Leonard made farewell speeches.

Priya: I am looking forward to returning home to India tomorrow but I will miss you all in California. My brother has got some good friends, I am very grateful to have been accepted into your social group. Thank you all for being so supportive of my relationship with Leonard and for our journey to India together. I look forward to seeing you all again in six months.

Leonard: Tomorrow I am going to India, it should be quite an experience. Thanks to all of you for being so supportive. Special thanks to Raj for being such a good brother to Priya and a good friend to me. Also thanks to Sheldon for giving Priya the chance to live with me. I will miss you all, see you all in six months.

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When Priya and Leonard got back to their apartment for one last night they were just getting ready for bed when a Skype call came through. It was Dr. Koothrappali!

Dr. Koothrappali: Hello Priya.

Priya: Hello Daddy, what a surprise!

Dr. Koothrappali: Rajesh tells me that you are leaving for India tomorrow.

Priya: Thats right.

Dr. Koothrappali: Is Leonard there?

Leonard: Hello Sir.

Dr. Koothrappali: Hello Leonard, so you are coming to India. You must be serious about my daughter.

Leonard: That is true Sir.

Dr. Koothrappali: Where are you staying in Delhi?

Leonard: The University has arranged some visiting scholar accommodation for us.

Dr. Koothrappali: When you are settled in please come and visit, the whole family wants to meet this man who is going to travel halfway round the world for Priya...