He has a few reservations.

"I don't know, Jane..." he said as he backed away, hands up. "I just, uh, it feels like cheating, you know?"

"Doesn't feel like that to me," she growled as she encroached on him. "Feels like you're gonna have sex with your beautiful girlfriend. She might just have some nerd chick inside her at the time."

Mark felt himself growing aroused in spite of his reservations. "I guess it's- oof!"

She had grabbed his hands and crudely shoved them against her chest. "Oh, Marky," she moaned in a noticeably higher voice. "Put it in your little Connie. She's been a bad girl."

Mark stared at her for a moment before bursting into laughter. She laughed too, sitting there with a stranger groping her tits. It was just funny.

"That's not even close!" he said with a chuckle. "Did you think I was dating Betty Boop?"

"You still have Betty Boop?" she asked, still chuckling. "That was ancient history in '74!"

"Well, when you-"

Mark was cut off as she leapt at him, crudely shoving her tongue down his throat. "This is Connie's body," she told him bluntly after breaking off the kiss. "It wants you. Mark, it needs you."

Mark was already working on his zipper as she finished speaking. She hurriedly shucked off her top and kicked away her shorts and panties before collapsing onto the bed with him, kissing him across his bare chest with frantic pecks. "Oh, Mark," she said sincerely. "I want you, I want your body, fuck me now!"

He didn't need any further encouragement. Reaching down, he was surprised to discover she was already completely lubricated. She grabbed his forearm and crudely jerked his hand away, then climbed atop him.

"No foreplay. Put it in me now!" Her eyes were glazed with animalistic lust and her hair swung wildly in front of her desire-twisted face. Mark immediately rammed into her and felt a gush as her body responded eagerly. She wrapped her arms around his back and pulled him in to an almost painful squeeze, her firm breasts pressed against his chest, their taut bellies meeting in lust-fueled exertion.

"More! More!" she cried loudly, throwing her head back and thrusting against him. "Oh fuck me, Mark, fuck me! Oh my God, what- what's happening?"

Mark was amazed at her energy. She pistoned herself on top of him, mouth agape, breasts bouncing wildly with the motion. A sheen of sweat stood out on her skin and to Mark it almost looked like she was moving in fast motion, like a video playing at double speed. The sheer intensity of the rhythmic pressure on his shaft hit him like a freight train and he sucked in air like he's been punched in the gut.

"Oh God, Connie, I'm going to-" and they were shouting in unison, an ecstacic ululation of pure pleaure. His ribs felt warm and even as he was spurting inside her he was aware that she had made deep gouges with her nails and he was feeling his own blood hot on his skin. This all passed through his mind as he stared at his girlfriend's magnificent breasts quaking on her pleasure-stricken form.

After a moment, she let out a shuddering breath and fell forward onto him. They lay together for a long moment before she spoke.

"Well, that was a pretty good first time."

He stared in shock. "Jane, you were-"

"Better late than never," she said with a wink. Mark felt a sudden tinge of sadness seeing a stranger's mannerisms on Connie's face. "Now I can finally think straight, so let's work on getting your girlfriend back."