The next day Peter was back to his normal size.
A sigh of relief, even though he did enjoy growing bigger muscles and having a nicely hung cock.
While thinking and waiting for what might grow next, Peter was interruped with a knock on the door
"Riley"?
"Hi Peter!... any plans for today?" Said Riley, as she winked and Peter and made her way inside his house.
"What are you doing here Riley"? Peter asked nervously.
Riley was one of the hottest girls in school and didnt even think that she knew who he was or that he even existed.
"Well i've been thinking about you for the last few days and i thought we could ... have some fun", Riley said seductively.
Riley grabbed Peter and thrust herself against his body, hot for his embrace.
Peter wasnt sure what was happening, but there was no way in hell he was going to miss this opportunity of being with the hottest girl in school.
He grabbed her tight and kissed her hard and passionately, with her returning the passion. Then Peters muscles started to grow, his pecs grew larger, his shoulders broad and wide, his biceps enlarging, veins pulsing and bulging down them.
He started to get washboard abs and could feel Riley running her hands up and down his thick, muscular chest, down to his abs, finally rubbing over his cock.
His penis then grew rock hard and started to grow to 10 inches long and 2 inches thick.
"Oh Peter! I want to have you deep inside me" ... Riley gasped out between each hot, steamy kiss.
Peter grabbed Riley's ass and grouped and squeezed it hard, not being able to believe what was happening right now. He picked her up and she wraped her legs around his waist as he carried her up to his room, all the while still swirling their tongues around in each others mouths, each kiss getting more hot and passionate.
Peter walked into his room carrying Riley and chucked her down on the bed, then pulled his shirt off to reveal his new muscular body, moving down to his pants to show his big, bulging, throbbing penis trying to grow out of his boxers. As he did this, Riley slowly took off hers in turn, dropping her crop top and her small skimpy denim shorts just off to the side of her.
Slowly Riley started to take off her bra and panties, with Peter watching in awe, and then noticing that Riley's boobs slowly start to grow bigger, firmer and fuller, all the while he was getting harder as he stripped off his boxers.
"Come here big boy, i want you to be on top of me and deep inside me" Riley said as she pulled Peter's body against hers.
Peter grabbed Riley's face and started pashing her hard, while running his hands over her boobs and the rest of her amazingly toned and fit body, before bringing his hand down to her pussy and then sliding his fingers deep inside her, making her moan out loud, and feeling hot and aroused and tingly all over her body with passion and longing she had never had before.
"I want you inside me Peter, i can't wait any longer for your huge cock"! Riley moaned as Peter grabbed his 10 inch long, 2 inch wide cock and started to slide it deep inside Riley's pussy, making her gasp out with so much happiness and pleasure.
Just then, Peter started to feel a tingly sensation in his groin, as his penis started to grow inside Riley.
"Oh my god, yes"!! "Grow big inside me baby, i want all of you"! Riley cried out as Peter continued to grow as he thrusted himself deep inside her, making Riley's pussy throb hot and tingle with pleasure.
He kept on growing and figured he must be atleast over a foot in length and growing out wide over 6 inches, with his balls now being the size of two apples.
Peter was feeling amazing! Big muscles, big cock and fucking the hottest girl he had ever seen.
Thrusting himself, deeper, harder and faster inside her, making Riley moan louder and louder with each thrust, while Riley also making her own boobs grow bigger to FF's. And Peter's penis still growing, now 2 feet in length.
Peter and Riley were both overcome with so much longing and passion, so hot and horny and not being able to get enough of each other.
Peter playing with Riley's nipples in his mouth, sucking on them and playing with each one of them between his tongue and teeth.
Neither of them had felt such euphoria before. Going harder and faster, harder and faster still, until Peter yells, "I'm going to cum"!!
"Me too" Riley cries out.
As they say that, Peter grabs onto Riley's hips and thursts himself inside her even deeper and faster than before till both of them thrusts their hips together and cum at the same time. So deep and explosive that they both cry out in harmony.
Peter collapses onto of Riley, both breathing heavily after their glorious sexcapade.
Once they recovered, they continued to fuck each other in different places all over Peter's house, not being able to keep their hand off each other. Each one of them shrinking and growing each time they fucked, until there was not one spot in the house where they hadn't fucked each other into oblivion.
This was one growing spurt that neither of them would forget.