Although Laura's mind was fading, and the boy seemed to be focused on that titanic effort, the vampire's mind had actually split. It was true that he had made many conquests in a few days, Laia, Gisela, Marta, Isi, and now Laura, but deep down the rage at thinking that his other prey, Angela, had been mistreated by a bunch of sons of bitches was flooding them with blind fury and rage, which was being physically reflected in the sex they were having. He needed to vent somehow.
When he came again with the boy, he did not think again that it would end, he had assumed that the pleasure would continue until that superhuman body wanted it.