Oh God. Oh Merlin. He was pretty certain that the only way this could have gotten any worse was for the man behind to mention Sirius. His brain seemed to have stopped entirely when he realized that the stranger had groped him from behind thinking that he was Sirius - and why he thought it was okay to be groping Sirius from behind and saying things like that, Regulus didn't even want to know. He violently wanted to be able to erase the last five minutes from his mind entirely.
He was going to kill Sirius the next time he saw him.
"No. No, I'm not." Regulus managed to answer, not particularly certain if he wanted to admit that he was actually Sirius' younger brother at the moment.
Regulus let out another strangled sort of sound as Adrian finished by patting him. As soon as he was free, he took two quick steps away from the other, eying him suspiciously. He wanted to protest that he wasn't prepubescent - he was seventeen for Merlin's sake and of age. But he still couldn't think of anything to say at all because he had no idea how to handle this sort of situation.