A/N: this is what happened after Charlie left Peter and Olivia in the room last chapter.

A Fiery Union, of the Unusual Sort

The door hadn't even closed before Olivia's hands resumed their tasks of undressing. She tugged on the waistband of Peter's jeans, as he returned to kissing down her neck, over her collarbone, his hands gripping her thighs.

Olivia was barely able to register Peter's breathy voice through her desire-clouded mind.

"Why does Walter want you for more tests?"

"Don't know." She voice broke as Peter continued his oral assault, moving down her neck to suck on the skin just above her breasts.

"Earlier, he said something . . . about wanting . . . to extend my emotional response,"

"Emotional response," he repeated, nodding slightly,

Olivia could feel Peter smirking against her skin, "I'm sure I can get a pretty impressive, not to mention vocal response from you in about 10 minutes."

Olivia laughed at his audacity.

They continued as if Charlie hadn't interrupted them.

Olivia managed to push Peter's pants down along with his boxers, pooling at his ankles where he kicked them off. He stood before her, ready, extremely aware of the beautiful, practically naked women sitting in front of him. Olivia's hands found his hair, her fingers tangling in it as Peter sucked on her pulse point.

She shifted so she was pressed up against him, completely. Peter groaned at the contact, feeling her waiting heat through the cotton of her panties. Peter tried to ground his hips into hers, trying to create more friction between them, resulting in a pleasurable groan from Olivia. She couldn't help but giggle slightly at his eager attempts.

Pulling one hand from his hair, she dragged it, torturously slowly down his chest to stroke him. He instantly bucked into her hand, resting his head on her shoulder as her fingers lightly brushed up his shaft, her thumb rubbing his tip. The guttural moan and sharp intake of breath only encouraged Olivia. When Olivia let go, Peter growled at her, completely driven by lust. Olivia smirked at him.

Gaining control of himself, he hooked his fingers in the waistband of her panties, pulling them down, while Olivia lifted her body. Seconds after her panties hit the floor, Peter pulled her closer, entering her hard and fast.

"Oh, God, Peter!" she gasped, her breath coming out fast at the force. She didn't care how hard he took her, as long as he did. As long as he clung to her like she was his lifeline, fell over the edge with her. She wanted to be with him, in every sense of the word.

Her nails bit into her back as she clung to him

Peter lowered his head to kiss each breast, subtly nudging Olivia away so he could take one of nipples in his mouth, sucking it gently, before giving the same attention to the other.

He moved inside of her, pushing in all the way, as deep as he could. He pushed her back, so she lay horizontal on the classroom desk, Peter moving with her so he was above her, him never leaving her body.

This made it easy for him to penetrate deeper inside of her, Olivia gasping as he moved over her sensitive spot. He did this several times, hitting the same spot. He could feel Olivia clenching around him. Her lips parting as she chocked on the scream that threatened to escape.

Feeling his own release and Olivia's inevitable scream, Peter kissed her long and hard just as he came inside of her. Peter continued to ride out his orgasm.

Peter locked eyes with Olivia, watching her writhe beneath him. Her breath coming out in sharp gasps that turned into very loud moans. He felt her clench suddenly and then . . . everything felt hot. Peter watched as Olivia's iris's turned a fire red, and as her hair caught alight. The flames moving down her body, up his arms and over his. Spreading, engulfing them completely as she came under him.

Peter felt a power surge through him, stirring him again. Olivia was still moving her hips up, thrusting against him, riding out her orgasm, when Peter suddenly gasped for air, a second orgasm washing through him, the power pushing his release. He unconsciously bucked into her, thrusting his hips against hers as she did.

The flames died down as Olivia came down from her high, eventually being reduced to a slight heat of her skin and her fiery iris's. They were both flushed and sated. Collapsed, together on the table. He reluctantly pulled out of her, Olivia groaning in protest as he shifted to her side, Olivia tangling her legs with his on the desk. Peter stroked up and down her arm as they lay there.

"We have to do that again." Kissing up her chest, her neck, lingering on the corner of her lips.

"Definitely." She smiled sweetly at him, turning her head so she could kiss him.

They were silent for a few minutes, unmoving, comfortable, tangled there together.

"I only have one thing to say." Peter murmured against her skin,

"Hmm, and what's that?"

"I like this 'emotional' response."

A/N: short, P/O – but hey, at least it's smut :P