Feeling the afterglow, Lisa sat down on the ground, with her original body watching. She could feel her new appendage was still very hard, and felt it twitch. Lisa closed her eyes for a moment, before hearing her original body moving. As Lisa opened her eyes, she saw "herself" taking off a drenched pair of panties, before going down on the floor on all four in front her. The front of 'Lisa's' nightie fell forwards, giving the actual Lisa a view of her of breasts, hard nipples and the sheen of arousal on her inner thigh.
"Thanks for the show Grace... Up for a little bit more?" Lisa heard her own voice whisper seductively. It was weird, but Lisa was definitely aroused, her cock twitching in anticipation as she nodded. The other 'Lisa' then gave her a soft kiss, before moving down and giving Lisa's still very erect penis a good suck, making a slurping noise.
"Oh, wow..." Lisa moaned, the pleasure and feelings different from the masturbation and handjob. She could feel the slipperiness and 'her' tongue flick around for a moment, before the other 'Lisa' came back up and smiled, straddling over Lisa's crotch. Lisa watched her own body in anticipation as it moved back a little, the down and forward to put Lisa's dick right in between the lips of her own vagina. She could feel the heat and wetness of her pussy, especially as the other 'Lisa' began moving her hips back and forth.
"You're so hot Grace..." 'Lisa' moaned.
"You as well... Let's put it in." Lisa replied, as her other self nodded. Wiggling a bit, the two positioned themselves, before inserting in slowly. Lisa saw her other self wince, before they continued. The warmth and tightness of her own pussy enveloped Lisa's dick as they did. Her other self began slowly moving up and down, Lisa then joining, pumping her hips, easily matching 'her' rhythm. She reached up and fondled her original body's bouncing breasts, feeling them as someone else for the first time. Lisa could hear her own voice moan softly, along with the soft grunts she herself was making in what she thought was Grace's voice. They had to remember to keep it down, though the thrill of this in her friend's house was all too arousing.
Increasing their speed a little, Lisa could feel the climax growing. 'Lisa's' pussy then squeezed and tightened, with 'Lisa' letting out a gasp. About to cum again soon, Lisa pulled out, pushing her own body back. As she did, her original body moved backwards, accidentally bumping into the bathroom counter and knocking the remote down with a clatter.