Rolf actually enjoyed being generous. He would never go so far to say that he was a selfless man, but he would profess to be unselfish; he did try to put the needs of others before his own. It helped, of course, that he liked doing it. There were limits, really, and he did still buy into classism and other antiquated, judgmental feelings. None of that, however, entered into this moment or his feelings about the wonderful man with whom he lived.
John could say whatever he liked at this point as Scamander was only half paying attention anyway. His focus was on the other man's sex, and he had ever intention of staying on it until Dawlish was willing to admit that this was the best birthday he'd ever had.
The man took a moment to rub his cheek against John's cock before exhaling quickly and taking him into his mouth. He brought his hands up to stroke the pale skin of Dawlish's thighs, and then caress him in the areas that Rolf's mouth just couldn't quite reach.