Miles was definitely trying to put the desire for a shag into her head. He wasn't going to push for one tonight, but that was all part of his plan. If he could get her thinking that's what she wanted, then the next time they were together alone in his room, with or without the alcohol, and definitely without the party raging on the other side of the door, he'd claim his prize.
Not that this wasn't fun. He was having a lot of fun as he let his tongue explore her mouth, his hands roam her body--just the G-rated parts of it, anyway. And he let her feel how hungry for her he was. If she wanted a shag, he would have been ready to give her one. If she wanted to wait, he'd wait.