The guy friend (Jonny) of MC was instructed to get MC girlfriend into a taxi and send home and he agreed , then he proceeded to go back to playing "spin the bottle" or just kissed her , we don't know for now what she had done beside that and how she got back home and when
Guy friend is saying that he got blackout drunk and don't remember anything , and when you stop pressuring him and just tell him that you know that he kissed MC Girlfriend , "he fumbles the ball" and says how you would he know that he kissed her you weren't even there , that shows that he did it intentionally because you wouldn't find out about the kiss and he is lying about that , as he proceed to lay that he would have tell you
Besides that the photo looks like he is kissing and having his hands under her skirt , Naomi is later implying out of anger that something can be already happening or already hapend betwen Jonny and MC girlfriend , and they are staying with it silent
Besides I now get what the story theme is about , people around MC and his girlfriend are seeing how happy they are together and how much they are doing for each other out of love , and are jealous and want a bite of their happiness or be a part of it