Later, we see Raymond hanging out in his bed, post dinner, snacking on some chips.
He hears Charlie and Susanna having sex and starts making honking noises in response. He walks all the way into Charlie's room and sits down on the bed—yes, still while Susanna and Charlie are having sex.
Once they realize Raymond is in there, Charlie freaks out.
Susanna tells Charlie that Raymond is scared and Charlie should go talk to him.
Instead of being comforting, though, Charlie gets mad and goes in to yell at Raymond for interrupting their sexytimes.