I can't be jealous when you're this good (suggestive)

Kellen stared at the devilish smile on the Captain's lips and tried to think back to the books and other things he had watched. His mind was coming up blank. Rhys' shoulders shook at the blank look on Kellen's face as soon as it was brought up. 

"I am going to take it that your research didn't cover that, did it?" Kellen stared at the man who was teasing him, making fun of him, but had also been gentle in taking care of him and listening to his every word. He bit his lip, and watched as the Captain's gaze grew piercing. "You did that on purpose." He accused, before bending and sucking the bitten lip into his mouth. 

Kellen's breathing became shaky the longer he did so, the Captain running his tongue along the lip in his mouth. He released it with a soft 'pop!' and Kellen's mind felt hazy.