10. eeyore9990 prompted me with Kingsley/Charlie: seal.
Affirmation (NC-17; Kingsley/Charlie; 230 words)
"When you said you needed to affix a seal to make our relationship exclusive, I wasn't expecting this," Charlie said, looking down at the straps that were binding his cock.
"Oh, that's not it," Kingsley replied, chuckling. "Head up. Shoulders back. Keep those hands at your sides."
"Now then," Kingsley continued, removing a small black box from his desk and opening it.
Flames shot up and then died down quickly, Charlie saw, swallowing against his sudden nervousness as Kingsley removed a small ball of what looked like wax from the container and flattened it with his fingers.
"This is the seal."
"Will it hurt?"
"You should know better than that."
"Sorry, I do—but why the cock bondage?"
Kingsley stepped forward until his body was almost touching Charlie's, and he whispered, "Because I like making you wait, and I can't have you coming from this."
Charlie felt the wax melt over the tip of his prick and slide down, coating him with a hot, tingling substance—and then his entire body began to shudder as a wave of pleasure rushed through him—but he didn't dare move more than that.
"Good boy, my boy," Kingsley said, lightly kissing Charlie's eyelids. "You'll stand there, won't you, while the 'wax' does its work?"
"You'll stand there, stock still, and allow me to claim you?"
"You're mine, Charlie?"