Vocal girls were hot, period. Simon wouldn't have cared if Cissy had screamed her head off, because if the neighbors had complained, he would have been able to tell them (with a sheepish grin) that he had been satisfyin' a lady, sorry for the disturbance.
Pleasing a woman was actually quite fun. It was even better when he had to slip his wrists around her skinny thighs to keep her a little steady so her could continue to work his magic. She was arching her back and moaning and getting all hot and bothered, and while it was sexy, it made it hard for Simon to keep his mouth on the task. Not that he minded at all. At least she was enjoying herself.
As her hips moved faster and faster, and her pillowtalk got harsher and more cuss-ladened, Simon used his both his lips and tongue to get her to orgasm. He wanted to say something sexy, but feared his talking might make her lose focus and thusly, lose climax. Instead he moved his mouth faster, more deliberately. Oh, yes, he wanted to make her scream.