He has her lay on a desk.

"Right, let's finish up," he smiled, putting the Note away. "Ruby, lay on one of the desks and spread your legs," he ordered, stroking his cock.

"Sure!" Ruby agreed easily, sitting on a desk and laying back, and parting her legs. He stepped between them as she scooted her hips closer to the edge of the desk.

Jaune fingered her folds for a moment, feeling their slickness, and then lined his dick up. She looked up at him and nodded. He pressed in, moaning as he felt her passage envelope his shaft. She gasped and clenched one hand into a fist as she squeezed her eyes shut.

He bottomed out, panting as he felt his dick being massaged by her vaginal walls. He then began to slowly pull out, then thrust back in. Her body jerked, making her small breasts bounce a little bit, and he repeated the process. And then he began to keep at it, slowly fucking her. With every motion of his hips, he felt her thighs brush against their sides.

She arched her back as he continued his gradual motions, and wrapped her legs around him. Seeing her arched back as an invitation, as it jutted out her boobs, he reached forward and caressed them. Both participants were in heaven as she rotated her hips into his thrusts.

He kept up his current pace for several minutes. Then he leaned forward and started to lick at her tits as he began to pump into her more forcefully as she got used to his feel. She gasped and wrapped her arms around his head to hold it to her chest as he began to pound her.

This couldn't last forever of course, and as the time was almost up, Ruby muffled her cry of ecstasy with a hand, cumming on his shaft. He of course followed suit, flooding her insides with his seed.

Both of them panted and he laid on her for a minute. At this point, the thirty minutes were up, and they both stood. "We should get back," Ruby said. "Don't want sis getting suspicious..."

Jaune nodded, and quickly redid his pants.