I am not doing this for profit and all canon characters belong to Rowling
After feeling brutal exhaustion, in heaven Severus takes a long peaceful sleep desiring to finally get away from the world that left him miserable his whole entire life. Waking away from the first healthy physical sleep in his life, he sees a beautiful Asian woman standing beside him: Good Morning, Severus
Severus now confused: Huh, who are you?
Nagini: I am Nagini
Severus gets even more confused: But you killed me, why would you want to talk to me?
Nagini: But that's the reason, I just really want to apologize and say I wish I didn't do that to you. I was sadly being mind controlled by Voldemort so I was being forced to kill you. Like hypnosis
Severus: I know, there's nothing to apologize for especially if you couldn't help it. I was once manipulated by Voldemort too, but I was fortunate enough to have the mental ability to stop after merely only a year. But you being physically a snake and having part of his soul inside you, you couldn't do anything about it. I felt empathy for you this whole entire time
Nagini: Aww, thanks and I felt empathy for you too ever since I died. I'm so glad that Voldemort is now finally dead
Severus: Really? I have just been finally enjoying peace that I haven't been paying attention. Now it is working out now that I have met you. I know this sounds strange, but I love you and I want us to be best friends. You are the most beautiful woman I have ever met, even more beautiful than Lily
Nagini is touched that finally after many decades she is now feeling affection and because of this hugs Severus: Thank You but I can't let you stay here for too long
Severus while feeling gentle physical affection for the first time in decades: Huh, what do you mean?
Nagini: Severus, you are only 38 years old. You have so much potential in your life left and have so much physically to enjoy and I won't left you waste it here
Severus: But I don't want to go back and if I do, you need to come with me. I will not tolerate being alone ever again
Nagini: But Rosmerta has been worried about you ever since you got bitten and she loves you. You won't be alone, I promise. She is waiting for you to come back and Harry has already acquitted you, so once you come back you and her will flee from Wizarding Britain and go to Jamaica and spend your life on the beach relaxing feeling nothing but happiness. Severus, you need to go back you have so much more time left
Severus: But I love you
Nagini: But my time is up, your time is not. I lived for 90 years and spent half of my 90 years feeling nothing but pain and suffering. I'm staying here, but you are young only 38 for goodness sakes and have so much left in you that I will not tolerate you staying here. I will always be watching over you
Severus is shocked not knowing what to say
Nagini: It's OK you don't have to say anything. Now get ready here's the spell to not only make you come back alive in the Wizarding World but have you come back in the same young physically healthy body: RESURRECTO
Severus is now in Hogsmeade and the first thing he sees is Madam Rosmerta
Madam hugs Severus: Oh my dear Severus, I'm so glad you are OK. Want to go to Jamaica?
Severus: Yes my dear, I want to be as far away from this Wizarding hell as possible and spend my life on the beautiful beach
Rosmerta gets excited: Me too! Let's Apparate!
Severus and Rosmerta are now in Jamaica drinking strawberry smoothies and listening to Bob Marley finally suffering no stress for the first time in 38 years