You told your boyfriend that you were fine with him having sex with other men as long as they never came in his mouth or ass. He understood that letting the top lick the cum off your bf's body and spitting it in your man's mouth is fine then
"Please? Dad has been so busy w/work. Said to ask you."
"Dude, that horny, huh?"
"Yeah..."
"And you want your big brother to 'fill you up'? Not Dad?"
"Dad said you could, since he's been gone."
"Ait."
"Really?!"
"Yeah. Now get suckin', lil bro. Let's see what you've learned."