Richie and Eddie, possibly open to others.
"Gross!" Eddie exclaimed, looking down at what was left of the cookie. The old worries about germs ran through his head and he had to chase those thoughts away by reminding himself of what they learned in school. Sharing a cookie wouldn't make him deathly ill. He and Richie didn't have any scary diseases just because they were two boys at a party together. Everything that his mom said was bullshit. He quickly popped the rest of the cookie into his mouth and ate it, as if to prove to himself and Richie that he wasn't a coward about the two of them together.
"You could have got your own. There's lots." He faked complained. He could get another cookie just as easily. He simply needed to be sure that he could still be a pain in the butt and be accepted by Richie, when they were on a date. He was fairly certain it was a date.
Eddie looked at the party goers again. "Don't eat too much. I don't want you to puke on me when we dance later." Dancing was what every other couple was doing.