Erica's horniness definitely increased. Her kisses start getting rougher and rougher. You try to keep up with her, but her athletic strength brings out a side of her you weren't expecting: her dominant side. She pushes you forcefully back into your chair, straddles your legs, and dives her tongue into your mouth. You eagerly reciprocate, running your hands across her back.
Unknown to you, however, the flashlight fell to the ground and flicked on. But the fall caused the light to switch to light blue. The light was shining at your feet and legs. You continued kissing Erica as your legs lengthened and grew thicker with muscle and hair. Your feet grew larger as your shoes changed into hiking boots. Erica's legs did the same. But the increased length and strength caused the chair to rock back significantly.
The horniness abates as yours and Erica's reflexes kick in. You both force the chair forward to an upright position, but Erica fell to the ground. Her larger and more muscular legs bump the flashlight, rotating it so that it's now shining at her waist. You don't notice and practically tackle her. Your tongues wrestled about, and you started to grind your shrinking hips into hers. You both lose the lower half of an hourglass shape as your lower abdominal muscles slowly grow and begin to push out.
Something else significantly changes, too. While your hips shrink and your asses grow more muscle, your vaginas are closing up. Unknown to both of you, ovaries emerge and drop down as a pair of balls once again. Your vaginas close as your dicks grow back.
Neither of you notice as your hard cocks grind against each other. Eric moans into your mouth as the pleasure from the grinding increases. He grabs your ass tightly with his female hands. His hands slowly go from small and dainty to thick and meaty.
You moan. You want to move this along even further. Maybe Adam, your new bisexual boyfriend, will simply join in when he comes back? This was just simply too good to stop and move to the tents. You are so glad you gave yourself a female upper body. You could properly enjoy grinding your tits into Eric's. Changing Erica to Eric was such a good idea, too. There would have been no way Erica would have been interested in having a threesome with two guys unless she was one too.
You remove your lips from Eric's. He groans, unable to do more to voice his complaint about the kissing ending. You smirk and lean back on your muscular legs and pull your shirt and bra clean off. You help Eric do the same. You resume kissing him. Your mouth moves south, kissing everything as you go. You stop at his tits and put a nipple in your mouth. You swirl your tongue as Eric cries out in a high-pitched voice. His legs jerk wildly beneath you.