Matt knew absolutely nothing about Adam or the relationship he had with Lyla. Honestly, he didn't really care. Lyla was beyond hot and excellent in bed, that was really all that mattered to him. As long as she was giving him what he wanted, he saw no reason in questioning her about her the boyfriend. Especially not when she had a tendency to feel genuinely horrible for what they were doing. The last thing he wanted her thinking about when he was planning on charming her out of her clothes was the boyfriend she had else where.
While their current activities didn't remotely resemble his intentions, he'd quickly gotten caught up in what they were doing. In hindsight, he'd definitely admit that it was stupid of them to carry on like that in the middle of the hallway but, right now, he didn't care about who may or may not see them. Which was probably why he barely even noticed the boy calling her name.
She felt good. She was most definitely reacting to him. Why would he want to stop? If anything, he was ready to push her into her apartment and finish this. Assuming that he didn't decide to do that right where they were. It was all the same to him, really.