A few towns across from where the Speedo Fags had started, a father's birthday was fast approaching. David had no idea what to get Rob (his dad) and his 42nd birthday was tomorrow. David had turned 13 the previous week, and due to unavoidable business, David's mother was going to be away for both, so David and Rob were "home alone" for the time being. David stared at his father as he tried to think of what to get him. Rob was tall and had black hair that matched his son's. Both David and Rob had green eyes and handsome faces. David was yet to properly develop any real weight or a proper package. Rob used to work out but had stopped a few years ago when he decided it was too much work, and although he wasn't fat, he certainly wasn't muscular. It was Saturday, and David concluded that if he still had no idea by today, he was going to ask his dad what he wanted.
"Er...dad?" David asked. Rob pulled down the newspaper he was reading.
"Yes?" Rob asked with a smile.
"I know it's kind of late, but I haven't got you a present yet and I was wondering what you wanted..." David said.
"Don't worry, you don't need to get me anything. Although I could do with a new pair of board shorts for swimming..." Rob added with a wink. David laughed.
The rest of the day worked perfectly. David bought a pair of red board shorts (which was odd, as the label informed they were black, but red was his dad's favourite colour) and wrapped them in the afternoon. David's present was ready.
The next morning David entered his parents' room quietly. His dad lay in bed still, wearing a pair of red boxer shorts. Rob opened one eye and spied David. He smiled and pretended to be asleep.
"HAPPY BIRTHDAY!" David shouted. Rob famed shock.
"Oh, what a surprise!” Rob said with a laugh. David hugged Rob and gave him his present.
"Thanks David," he exclaimed as he ripped apart the wrapping and produced the red shorts.
"These are great!" Rob announced and hugged David one more time.
"So, do you want to go swimming at the Pool? Give the trunks a "test dive"?" Rob asked, laughing at his own joke. David groaned at the pun, but told his dad yes and went to get ready.
5 minutes later, David and Rob were getting into the car. Rob was wearing a blue singlet and a long black tracksuit over his board shorts, and sandals on his feet. David was wearing a white t-shirt and his blue board shorts, and his sandals as well. Rob was about to start the car up when he suddenly felt something tight hugging his balls. He shifted around a little and itched himself a bit.
"Everything okay Dad?" David asked.
"Yep, everything’s fine!" his dad answered with a weak laugh. But everything was not fine. As Rob looked at his son he felt the need to hug him again and even kiss him. Beginning to sweat slightly, Rob tugged off his blue singlet.
"Phew," he stammered, "Is it hot in here or is it just me?" Suddenly, something large began to throb against the front of Rob’s track suit and it took him a moment to realize it was his boner. He ran his tongue around his mouth. It felt dry. Rob could hear a faint stretching sound; the seams of his pants were being pushed outwards beyond what they would be able to accommodate, which was a fair amount. Rob’s leg and arm muscles were ballooning greater than he could have achieved after months at any gym, and his chest, which was normally flat and slightly hairy, became totally bare and abs began to form up it. His fair skin began to tan and his hair became lighter.
"Dad?" David asked as he watched on. "What’s happening?"
"I...don’t...know..." Rob groaned as his pants got tighter than ever. He could feel his "shorts" beneath the pants riding up his ass and he didn’t know how he could stop the change he was going through. Rob’s face contorted with pain as he grew even larger still, tearing apart the waist of his track suit. Below the rip, Rob stared in amazement at a pair of red speedos that were definitely not there before. Even more amazing was his boner which was larger than it had ever been. Rob thrust down the remains of his pants and kicked off his sandals. He felt a lot younger and muscular, somewhere in his early 20’s. The changes appeared to have stopped.
"Wow Dad!" David exclaimed. Rob turned to him and smiled.
"How about a "birthday kiss" for ol' dad?" Rob asked David.