A friendly chat.

"Ahhh, that feels amazing." Janet sighed as the feeling hit her. After a beat, she spoke.

"You know, you keep telling my sister you don't know anything about this and she has to believe you. I don't, though, and I find it suspicious that this showed up in your apartment with no apparent explanation. So I'll ask again - what do you know about this?"

Jake was expecting this. "Nothing." He insisted. "I really have no idea. If I did, do you think I'd be desperately trying to figure out what it is?"

The logic made sense to Janet. She still didn't trust him simply because of how much power he had over her sister, but she was also somewhat influenced by Sam's feelings of warmth and trust.

"Alright, let's assume you don't know anything. How do we know you're not sabotaging the experiments just to keep Sam subservient to you? I mean, this is every guy's dream, right?"

Jake protested. "Hey, that's a hell of an accusation! Sam is my best friend and I never wanted to hurt her or change her. I want her back as much as you do! The thought of her real self being buried forever by whatever this thing is terrifies me. I love her!" As soon as he said it, his eyes went wide and his hands flew to his mouth.

The effect on Janet was instantaneous. Her cheeks flushed and she leaned forward. "Yeah?" she asked breathily.

"N-Not- I mean, she's- you know, I, uh-" As Jake stammered he glanced down at Janet's cleavage. She smiled devilishly at that." Mmm, do that again."

"Do what?" Jake was confused.

"Look at my tits. Oh, yeah, again!" She started to unbutton her blouse and approached Jake. "Wanna feel em?"

Jake stumbled back. "Janet, what are you doing?"

She moved against him and wrapped his arms around her, planting both palms on her ass with a sigh. "Mmm, I think this is turning you on. Sam's picking up on your arousal and, ah, amplifying it. She's not here to feel the shame or guilt, though." She spoke into his ear with a sultry whisper. "I'm getting all of the pleasure and none of the guilt."

Jake pushed her back. "Janet, this is wrong! I just told you I- I love your sister! We can't do this!"

Janet slowly approached him again, undeterred. "Oh, believe me, she doesn't have a problem with it. After all, the lines are so blurred..."

Jake still had his misgivings, but this time he didn't resist as Janet reached for his zipper. He recalled their mutual masturbation session. "What if Sam comes out of the shower?"

Janet had thought ahead. As she unbuckled his belt and his pants dropped, she reminded him of his connection. "I think she knows perfectly well what we're doing. If she objected, she'd come out. She's in there enjoying herself alone, and I can tell you that she's not feeling jealous or unhappy at all. If anything, she's impatient."

His pants and boxers around his ankles, Janet shoved him back into the bed and began to take off her top. "Strip." She commanded.

Soon both were nude and flushed with desire. Janet climbed on top of him, gasping as his erection pressed against her bare mound. "Ahhh... this is so strange, I can feel what turns me on, what turns her on, and what turns you on, all at once. It's like a... mmm, like a dream." She started slowly gyrating her hips, grinding against him. Jake reached up to cup her breasts, sending a chill down her spine. "Oh fuck yes, more of that..." She put her hands over his and pressed them tighter against you her firm tits.

Suddenly, Jake shifted and pressed his cock against her opening. She was fully lubricated now and he slid in without resistance. From the bathroom they heard a cry, and both laughed. The laughter was cut short when he rammed into her with full ****. Now it was Janet's turn to cry out with pleasure. "Oh fuck, Jake, I can feel you inside of me!" The double meaning wasn't lost on Jake as he began to rhythmically pump. Each thrust elicited a small gasp from her. "Oh my God, my body is on fire!"

As their tempo increased, Jake reached up to cup her sweating face in his hands. She shuddered as he gently rubbed her cheek with one hand while the other slowly traced down her neck and collarbone to tweak a nipple. She threw her head back and a drop of sweat flew off her nose and onto his forehead.

As their rhythm slowed briefly, Jake took the opportunity to shift position. He was now moving side to side slightly, exploring every inch of her. She moaned as he suddenly placed both hands on the back of her neck and drew her in for a passionate kiss. As her nails dug furrows into his chest and he pulled her into himself by the hips, they tensed every muscle in unison. For a moment she felt an unfamiliar but intensely warm sense of release as he emptied his seed into her, and she collapsed soundlessly onto him.