So much sexual frustration. Sex between them must be so aggressive and painful but pleasurable pain. Klaus would bite Stefan and let the wolf venom slowly make Stefan writher in pain and make him weak and then Klaus would just fuck him rough and fast until Stefan is crying out. And he doesn’t know if he’s crying out in pain or pleasure, it’s just a mix of euphoric feelings. And they’d come and Klaus would make Stefan beg for his blood for the bite to heal and Klaus would just wait a second, stare into Stefan’s eyes and sees the vulnerability. So Klaus gives him is blood and they kiss and then Klaus holds Stefan in his arms and they fall asleep.