Thomas was able to cling onto his coherent thoughts at that point. Though it wasn't the case during their earlier actions. But as he felt the first of Jack's release hit the back of his throat, that familiar warmth and taste. Thomas didn't need any particularly higher thoughts at that point. He just knew what he wanted to do. Swallowing down everything that Jack could give then.

Only when he was sure that Jack was finished did he pull back, tongue paying attention to the head of Jack's cock again as if he might have missed a last drop. Licking carefully across before he lay his head on Jack's chest.

"Perfect combination of you, cake and shots." He looked up at Jack. "Happy birthday to me." He looked smug again. Content. Like he had everything. Which as far as Thomas was concerned about himself, he did have everything.