Reiner's eyes lid for a moment when Marco rolls his hips down against his. The pressure has him breathing out on a soft sigh against the side of his neck, and he half wants to pull him closer against him, rolling his hips up against his.

Luckily, he's always been rather straightforward in what he wants, and he has no issues in voicing his thoughts. He strokes his fingers slowly over Marco's hips. "Wanna ride me?" His eyes flick away from Marco's face to meet Bertolt's over his shoulder. "I bet Bert wouldn't mind getting his mouth on you while you do. If you want."