After the Sage of Six Paths forcibly gave Sasuke a cheat, he left to find Naruto.
"Huh? Where am I?"
The moment Sasuke opened his eyes, he saw Karin pressing herself right up against him, giving him quite a fright. What was she trying to do? But he had only just woken up, and his body was still a little numb. He couldn't dodge in time, so Karin got her way.
Karin had only dared to be so bold because Sasuke was unconscious. But now he was awake, and she had actually kissed him. Looking into his eyes, she grew even more embarrassed. Her entire face flushed red, and she simply closed her eyes.
The sensation against his lips left Sasuke utterly stunned. Uh...
Sasuke's brain crashed. No one besides Naruto had ever kissed him, and for a moment, he had no idea what to do. A line popped into his head: Ignore the risks and continue installation.
Fortunately, Karin knew this wasn't the right time and let Sasuke go.
"Huh? Sasuke-kun, you're awake? Well, I saw that you weren't breathing, so I took it upon myself to give you mouth-to-mouth."
But Sasuke looked at Karin as though she were an idiot. If you hadn't slipped your tongue in just now, I might have believed you.
Embarrassed by his stare, Karin hurriedly pushed Sasuke off to fight.
There was nothing he could do. Since Karin was chasing him away, he couldn't very well stay.
But before leaving, Sasuke said one thing to her: "Karin, wait for me. I'll take responsibility for you."
Sasuke vaguely remembered that, back when he had accidentally kissed Naruto in the classroom, some of the girls had said kissing could get someone pregnant.
He had just kissed Karin, so he had to take responsibility for her.