John did grab the table. He felt like an offering in this position. But that's what he was? An offering to appease his master.

He felt like... Like the waiting made it so much more. The anticipation, the lust, the want and everything.

He gasped with each slap against his arse. But then. Oh then Sherlock was pulling the plug out and pushing in. He cried out at the sensation. There was no resistance, no pain. Just the feeling of Sherlock taking him. Owning him.