You have an older brother Noah and he's 28, Peter is his friend and he's 30, Peter comes to your house quite often to hang out with Noah

Your brother went out to the store, you're sitting in the living room couch watching TV when you hear a knock on your door, you stand up to go open it, when you open it you see that it's Peter

Hey

You say and smile

"Hey, can i come in?"

Peter asks and smiles back