What happens next?

Use Thomas to claim Emma

The two of you put away your cocks. You use your newly won post-nut clarity to figure out the situation. Thomas is now your cum brother, but what's going to happen next? You must leave the inscription on Thomas, or he will rat you out when he returns to his senses. But that mean Emma will also see the text sooner or later.

Of course! You figure out the solution soon enough. You push the Sharpie into Thomas' hand and whisper some instructions in his ear. He enters the yard and goes straight to Emma. "Hey baby, what are you doing with the marker?", she asks Thomas cheerfully. "And why the hell did you write RYAN'S JACKING BUDDY on your arm?"

Thomas doesn't answer. Instead, he scribbles the words RYAN'S SLUT onto Emma's forehead. "Hey, what are you doing?" she protests. "And where's my master Ryan?"

"Right, right, let's make a slight adjustment", you say as you rush to the yard, take the Sharpie from Thomas and alter the text to say "RYAN AND THOMAS' SHARED SLUT". Emma looks at the two of you cheerfully and says "Hello, masters! What's it going to be?"