Sherlock took a moment to grab a pillow and indicated that John should lift up his hips. He slid the pillow underneath John's hips and butt, which gave him a better angle for what he wanted to do.

And now, he had unfettered access to what he wanted. Sherlock used his hands to keep John spread while his tongue teased around his skin, at the perineum and the skin around the entrance, but not quite there yet.. almost brushing against it but not quite...

And then... just the lightest brush against the sensitive skin, almost too light to be anything, but there all the same.