10 years later? A lot can happen - I'd guess
Here’s my scenario:
10 yrs later - (if this should be in FanFic, I apologize, but we're speculating about the time slip here)
We see a house, standard type, the characters appear more mature, obviously.
As the camera zooms in, we hear (typically) Kirino yelling at Kyousuke (who else?)
Inside we see your standard interior with K&K arguing (about a new game she wants to get, possibly)
She argues ‘the twins are with Mom, so we have until about 4 o’clock this afternoon, whats the problem?’
He says he’s waiting on a call, she says that shouldn’t keep him from going, and he gives in
They spend the day out doing things, joking, arguing, talking about people (Saori, Ayase, whoever)
We find some background on other characters, maybe they meet one, another calls from work and we see what they’re doing
They arrive back at the house with the game and try it out, but it’s getting close to 4pm
Kyousuke asks Kirino if she wants something to drink, and Kirino clicks ‘save’ on the game
They go out to the kitchen. They have a short talk, remembering things in the past
Then, the front door opens and Kuroneko walks in with a little girl in tow…K and K go to meet her.
As Kirino and Kuroneko approach each other, the little girl shouts ‘Daddy’ and runs into Kyousuke’s arms and he picks her up
After finishing the hug with Kirino, Kuroneko moves over and kisses Kyousuke on the cheek, asking how his day was.
Kyousuke looks at Kirino and says ‘the usual’ at which point Kirino punches him in the shoulder (the one not holding the child)
Then Kuroneko asks Kirino if she can stay for dinner,
Kirino says no, (husband’s name here) is cooking dinner for her and the twins, then they’re going to a movie
Kirino then says ‘well, I’ll be seeing you’ , and takes her leave. The door closes.
Kyousuke puts his daughter down and she runs off, while Kuroneko goes into (the kitchen?)
As she walks toward the street, Kirino turns around and looks back at the house with a wistful look on her face, then a smile pops up on her face, ending with a copyright Kirino laugh as she turns to leave
Inside, Kyousuke is by himself still looking at the door with the same look on his face, that turns into a little smile and a chuckle.
Kuroneko sees him looking at the door and the look on her face is a little sad, but understanding and not upset
Camera pulls back from the house and you can see Kirino walking away toward her own home and family (talking on a cell phone of course) while, in the front window, you see Kouskey’s daughter running and laughing, being caught and picked up by him as kuroneko tells him to be careful with her or she'll curse him.
The end . . .