Jack can't believe it. He was still watching his own body when Mark patted his back.
"Wow,you're really handsome." Mark said. "Much better than the teenager that you're pretending to be."
"I wasn't pretending. I'm 16!" Jack replied upset. "You changed my age against my will!! How dare you do this to me?!"
"Calm down, man." Mark said. "It's just temporary."
"I don't even know you!" Jack yelled. "I'm going to call the hotel securi-" Jack was suddenly interrupted by a kiss from Mark. His lips making contact with Mark's, his jaw feeling the rough skin of this unknown man's stubble and then, a wet thick tongue trying to enter in his mouth and moving along with his own.
Jack knew it's wrong. He had already kissed several girls in high school but this was his first time with a dude. Mark started to hug him and rubbing his back. Jack slowly followed up and put his hands on Mark's hip.
Their kiss extended for a while, no matter they'd just met or they're displaying a show in the water slides. It was until Mark started to touch Jack's ass when he reacted and pushed the young brunette away.
"W-what the heck is wrong with you?!!" Jack yelled at him but Mark just smiled back. "I'm not gay!"
"That thing doesn't think the same." Mark grinned as he pointed at Jack's crotch.
Jack looked down and noticed that he was sporting a kind of obscene erection that his speedo wasn't hiding at all. He felt ashamed and covered it with his hands.
"Come with me." Mark took him by his arm and pull him through the place until they were behind the restrooms. "Nobody will see us here."
Jack was confused, he didn't want to take his hands off his crotch.
"Let me see it."
"N-no." Jack protested but he didn't any effort as Mark put his hands on his bulge.
"It's big. Just how I like them!" Mark was rubbing Jack's dick through the speedo's fabric and then he started to pull the clothing down. Jack didn't do anything but watch how slowly his pubes were poking out from his speedo, then his shaft base and finally it jumped out like a spring.
He had masturbated a few times in the past and he'd never seen his dick as big as now. His engorged uncut dick head was leaking precum since a while, something that Mark noticed after seeing the mess with Jack's ball.
"You're so dirty, big boy." Mark said seductively as he started to kiss Jack again, but this time rubbing his dick instead of his back. Jack was no longer confused and accepted the kiss unknowing what was coming next.