Sinister was sorely tempted to shove a painful spike of psychic energy straight into that open mind following him with such trust. So very tempted to turn the moment into a painful lesson of using caution when it came to opening one's mind to the world at large.
On the other hand, he was rather enjoying the chance to rifle relatively easily through the boy's thoughts. He couldn't get far, so the information and emotions gleaned were minor. But it was a pleasant victory that Remy was handing him on the preverbial silver platter.
Sinister allowed himself to smirk in response to the words and continued sending those soothing sensations, however false their intentions were. If he spiked the boy now he might never get another opportunity to pick his brain. And while the mind was open, seeds could be planted. Little bubbles of subtle urging placed near certain thoughts and memories and emotions.
Nothing large or over like a total memory make over. But small things, like a slightly stronger sense of loyalty keyed to any thoughts about Sinister himself. And perhaps just a bit more disgust when thinking about betraying him. Little things that wouldn't be out of place and were hardly overwhelming but improved Sinister's chances of keeping him close and not loosing him to the X-Men as in Billy Kaplan's version of the world.
"Cheap booze and even cheaper women are hardly to my taste when it comes to actual celebration," He replied with an easy, teasing tone, "And what might we be celebrating anyway, hmm?"