Marty was un sure as to why he was making out with Damien. Sure, he liked it now he just wondered how he was going to act tomorrow. Though with Damien they became fast friends and that was something that mattered to him. They became friends first and then they drank and did this.
When he felt Damien's tongue in his mouth that was different, but he would also like to try that himself. He slipped his tongue inside of Damien's mouth and let out a sigh, it was great. When he pulled back he deepend the kiss, letting his hands explore Damien's upper body.