Karyn led Jon into the bedroom where their brand new king-sized bed was waiting. She couldn't wait much longer for Jon to figure out what was going on, with one swift motion, she grabbed Jon's blouse and ripped it off, tearing the buttons and revealing his well toned chest and large breasts barely contained in their bra. Shorty afterwards, Karyn grabbed the waistband of Jon's skirt and panties and pulled them down around his legs, exposing his new, or rather old crotch to daylight.
When Jon was 18, he was pretty much finished growing, so he practically had a penis at it's full size when he swapped with Karyn, not too small or too big, a respectable 8 inches. However, when Karyn went through her 4 year growth spurt with his penis, it started to grow in size again, when erect, it was nearly 12 inches long and a couple of inches thick. Karyn and Jon always thought of it as their little blessing. She now got to see her dick from the outside in for the first time in a long time, forgetting how large it actually was to others.
Jon had caught on with the act and started to undress Karyn too, he lifted her favourite green sweater over her head and threw it away, luckily the sweater was always baggy on Karyn so that she could keep wearing it as she got older, underneath her much larger breasts were tightly wrapped behind a tank top and a sports bra. Karyn didn't like regular bras as she felt they didn't provide enough support, so she'd taken to wearing sports bras as often as she could unless she was going out in formal wear. But that didn't matter to Jon; he ripped it off her just as ferociously as she did off him. Karyn kicked off her jeans and red panties as Jon lifted her top off.
Karyn lunged on Jon, he toppled off his heels and back onto the bed, she kissing him ferociously, practically biting at his neck and breasts, and Jon was just as fierce in his affection. He went straight for Karyn's breasts with his mouth, squeezing each nipple with his lips till they squirted milk in his mouth. Karyn moaned with each suck, as Jon finished with one, he moved to the other, wrapping his pouty lips around her erect tit and sucking until it leaked in his mouth.
"Oh God, Jon, do it now", Karyn moaned. Jon was only too happy to oblige.
It was a new experience for him, he'd never actually had sex as a male before, his first and subsequent times were with Karyn and all the times, she had the penis in the relationship, literally. He fumbled a bit, trying to get the position right; Karyn sighed in frustration and grabbed his erect member, guiding it into her waiting pussy. Jon pushed it in with a satisfying slurp, he's got Karyn so wet that it practically slid in there without any resistance. His penis pushed in until his red pubic hair mixed with her blonde muff.
Karyn grinded on Jon's penis thrust in and out, in and out, over and over, each time Karyn moaned a little louder, Jon grunted as he did so. It was an incredible feeling building up to a climax like he was; his nipples were throbbing, erect to the point that they could cut steel. Jon's high-heeled boots clicked with each thrust he made, the bed wobbled as Karyn tried to push harder and harder on Jon's waiting dick, all he could do was wrap his arms and legs around Karyn and try to draw her closer to him. Jon released in Karyn, she screamed in ecstasy as his seed made its way into her vagina. Jon was stunned by the feeling of his dick as he experienced his first male orgasm.
Karyn collapsed on top of Jon after a few moments, panting heavily; she snuggled up to Jon's breast. Jon lay there, dozing off. Karyn's breath slowed as she enjoyed her first multiple female orgasm from Jon, although she technically did most of the work. Her throbbing breasts rubbed up against Jon's own. She looked up and saw Jon had fallen asleep, in a very un-lady like way, his head lolled to the side, wide open with a bit of drool trickling from the edge of his soft mouth and down her face. His once neatly done up hair now stuck to his face which was still covered in seat.
Karyn let herself a moment of quiet amusement, even after so many years of having a female body, and a smoking hot one at that, he still had very male quirks that made her laugh. She even caught him early in the morning lifting the toilet seat to pee before realizing he no longer had the equipment to do so. Not to mention he was still occasionally hesitant to wear overly revealing clothing. Only in private did Jon ever tell Karyn how he really felt about his body, and it wasn't told in so many words.
She rubbed her head against his breast, trying to get in a more comfortable position and fell asleep to the rhythm of his breath.
