In a matter of seconds, Reno was on top of her, pushing her down onto the bed. Part of him very briefly contemplated asking, making sure whether this was really what she wanted. But that was just a remnant of all the time she'd spent making sure they never went this far; one look at her face was enough of an answer. There was no fear or uneasiness there, just desire.
Another part of him thought about teasing her, a return for how she'd been with his pants earlier, pressing up against her just barely, but not really pressing in. But he had entirely not the desire nor the self control to actually do that, so he thrust into her all the way, gasping loudly as he did. For a moment, he didn't move again, just relishing the sensation of being in Maria finally.