"NNNNnnnggg!!" Sherlock groaned loudly. His head was terribly sensitive, but John knew exactly how far to go without taking it too far and going from pleasure and pain into just pain.

The hair pulling urged Sherlock to go even deeper. Even after all these years, he couldn't quite get John's human cock inside his mouth- his Demon cock was WAY too big to ever take, sadly.

Sherlock tightened the seal around John's thick cock and suckled even harder, trying to coax John to come. His hand played with John's bollocks, teased his perineum, and almost touched his hole, but not quite, and then went back up the perineum and back to his balls.