Breaking some speeding laws, Suzie managed to make it to Steve's lab before he left for the day and marched inside. There, she found a distracted Steve fiddling with some roses. When Steve turned to look at who had just arrived, it was speechless at the sight of the stunning ginger fuming at him. It wasn't until he saw Suzie's warm, brown eyes that he realized this fine young, specimen was his girlfriend.
"Suzie, is-is that you?"
Suzie was about to nod and give Steve a piece of her mind, but the roses stopped her. They invaded her mind, forcing her to calm down. Within seconds, they helped Suzie understand everything. They told her that they'd modified her in order to please their creator, Steve. They realized that due to unforeseen genetic defects, they wouldn't last the week. In addition, Steve would no longer have the resources to recreate a flower near their caliber. So, in a way, they hoped to live on through Suzie. Once Steve absorbed some of her cum through sex, he'd bind his being to hers, making him just as immortal and ageless as she now was.
The roses also began to alter Suzie's mind. Increasing her submissiveness, her love for Steve, and her need to please and serve him. By the time they were done, Suzie stood before her worried boyfriend, horny and soaked.
"Suzie...I don't know how this happened. But I--"
"Sshhh," Suzie whispered, approaching Steve. Tearing off her clothes, she pushed Steve onto his desk and pulled his cock out. "I'll make everything better."
When Steve began to push her off him, Suzie squeezed him, making him hiss. Once she knew he was putty in her hands, she admired his lovely member, tracing it with her soft hands. Memorizing its contours, Suzie swore she'd worship it (and its owner) for as long as they both shall live.
Knowing she needed to make their arrangement permanent, Suzie guided his dick into her wet passage. He fit her snuggly, especially when she took all of him in. Steve groaned in ecstasy, and unconsciously began to grope his sex-kitten of a girlfriend.
When Suzie felt his hands on her breasts, she instantly came. The tightening of her walls around Steve's hardness made them both groan in pleasure. Steve pinched and tugged each nipple according to their rhythm, making Suzie climax several times. When Steve felt himself close to coming, he grasped Suzie's beautiful face and had her eyes meet his.
"Is-is this what you want?"
Suzie, touched by his kindness, could only kiss Steve with abandon, their tongues dancing sensually against each other. Their kiss muffled Steve's moaning as he came in her tight pussy.
Once he was done convulsing, Suzie leaned in and whispered her acceptance of this new role--and body. She explained to Steve what the roses had told him, and though he was saddened by their inevitable loss, he was more than content by her changes.
The two decided not to do dinner that night, Suzie making Steve his favorite meal in his apartment. Deciding she'd need constant monitoring until he was sure her condition stabilized, Steve demanded Suzie move in with him permanently. Until she moved all her things with him, she'd sleep in his bed.
Steve made the proposition seem like it was made for the sake scientific inquiry, but based on the hardness Suzie she could feel while sitting on Steve's lap, she knew he just wanted to fuck her as often as she wanted to fuck him.