They'd gotten good at their unspoken language, the two of them had. She told him to do what he wanted and he let out a quiet noise in response, but nodded his head. “O-okay,” he swallowed thickly.
His hand on her hip moved slightly forward, coming to rest on her thigh and sliding lightly upward. Leading. He wasn't used to it, but he'd be lying if he said that he wasn't intrigued by the concept.
Normally, he'd take his time with this, but with her laying on top of him like she was and the way she was touching and kissing him... it wasn't going to happen. As much as he tried. His hand slid between her legs, sliding his thumb along the edge-hem of her bathing suit bottoms as he moved the elastic of his own swim trunks down just slightly with his ring finger and pinky. Moving his other hand to join it, he glanced down between them just slightly, taking his interest in one hand, and using the other to move Ellie's bathing suit bottoms to the side.
Looking back up and locking eyes with her, he positioned himself just so and rocked his hips upward, sliding slowly into her with a low, gutteral groan.
“Mmh,” was the only noise he made, before he pressed his lips to her neck to stifle any more sound.