The kiss.
When taking this attitude, Alexa knew that Klaus would not back down. She knew he would sensually take her mouth and taste the antidote.
And she also knew that if she didn't have a lot of willpower, she wouldn't be able to resist the taste of his lips. Because there was a spell that had an immediate effect on her, even though Alexa didn't want to give in to it.
Klaus' fingers dug into her flesh, and Alexa's dug into his hair, letting him delight in her mouth.
Klaus groaned with pleasure, and bent down to lay her on the grass, when they heard sounds that denounced people's arrival.
With a frustrated grunt, the First Prince stopped what he was doing, straightening up and narrowing his eyes. Turning to the forest, Klaus finally untied the headdress.
'I think I have to thank whoever is coming, friend or foe,' Alexa thought, relieved.