You let him suck you

You dragged Evan into the nearest broom closet and push him down to his knees.

Understanding what you want, Evan uses his teeth to pull down the zipper of your jeans and rubs his cheeks against your clothed, half-hard cock that he had not been able to enjoy for the past two weeks. He made tentative licks through your underwear, teasing you in hopes that you'd let him suck you for real this time.

"Good boy," you praised the submissive twink, "You can take it out. You've earned the right to drink my cum today."

Ecstatic that you were going to let him suck your cock, he eagerly exposed your now hard cock and kissed the tip. He then took you into his mouth with practiced ease and soon enough, his nose has deep into your pubes. You gave him a few minutes to enjoy your cock before taking over the experience to get what you wanted.

Understanding that what mattered was your pleasure, Evan just took everything you threw at him as you started to slowly long-stroke into his mouth, trying to see if he still had a gag reflex. Feeling your balls start to churn up, you hasten your pace and grab Evan's head, skull-fucking the depraved twink's oral cavity against your massive member. And soon enough, you let loose a torrent of your cum up into his gullet. You pulled out of his mouth, his drool still dripping all over, and wiped the excess cum against his lips.

"Thanks, I needed that," you tell him as you cleaned yourself up, "I think you deserve another reward, boy. Come to my house on Saturday for a true treat."

Evan, still a bit dazed from the skull-fucking you had just given him, nodded excitedly, "Yes, sir. Your boy will be ready and willing this coming Saturday."

You give him a coy smile and help your scientist friend up.

"You might want to clean yourself up," you mention to Evan, pointing to the growing wet spot on his pants before leaving him behind in the broom closet by himself.