It's night time and its late, Brutus is in his house and Lucius is there with him. Brutus has made his decision on if he wants to join the conspirators and plan to kill Julius Caesar. 
Climax
I think we should kill all of Julius Caesar's friends 
NO! we should not do that 
They start talking about the plan to kill Julius Caesar it's Cassius, Lucius, Decius Brutus, Cinna, and Casca they are talking about if they want Cerieo in the group to kill Julius Caesar. Many of them think that Cerieo might not be a great fit for the conspirators. 
Falling Action
Lucius tells Brutus that there is Cassius wants to see him and Brutus ask if he is alone which Lucius tells Brutus that he is not. So they let in the conspirators in Brutus home. 
Resolution 
I know you are finding something from me tell me!
I'm not finding anything from you 
I will do anything for you my lord 
Cassius brings up the idea if they should kill all of Julius Caesar's friend right after they kill Caesar, like Mark Antony but Brutus does not agree with that part of the plan. 
Questions?
The conspirators are worried that if Julius Caesar does not show up to the Capital then there whole plan would be a waste. Decius Brutus says that he will make sure that Caesar will make it to the Capital that day of his murder. 
What if he does not show up to the capital ?
I will make sure he does show up to the capital.
That's good
 Portia knows that Brutus is hiding something from her and she wants to know what But Brutus won't tell her. When Ligarius comes to the house of Brutus he pledges to do anything that Brutus ask him to do and he will do it.