"I wouldn't know. You could have someone else. It doesn't seem unusual in this time." He'd never get used to how free people were. He couldn't understand how they could expose themselves so much and to so many people.
Regulus loved to see the change in Jake, hear his voice lower. He had no doubt that they were both thinking about unnatural acts that felt all too good.
He followed Jake, more than happy to watch him change, but his good humour ended the moment Jake mentioned Dumbldedore. He knew what Potter had learnt and he trusted Potter because he was a stupid Gryffindor, but Dumbledore was something very different.
"Slow down, and explain properly? What does he know about the potion? What do you know about it? And what did you say that made him trust you with the information?" Regulus had a lot more questions but those would do as a start.