The porn actor explained to Arron Lowe that he sabotaged his house rival's prized possession, won in the lab rats' shopping task, because the 24-year-old club promoter "can't be a nice person".
"I think he'll be angry, I think he'll kick off," he continued, agreeing with Arron that Luke can be "a bit of a pansy".
"We might see the more aggressive side of him... that's his protein. That's one of the few things in life he's passionate about. He won it and it's his little prize, he's not sharing it with anyone.
"The one reason I put it in is not because it was him, not because I was jealous, but because he didn't share it. If you can't be a nice person, well, you get what you deserve."
Arron promised to keep his knowledge of the prank secret and played along when Luke finally discovered what had happened to his protein powder.
"[That's] disgusting," the model declared. "Mate, that is bang out of order."
Luke, however, tried to downplay the incident as a mere annoyance but could be seen furiously banging on the button of the Diary Room afterwards and threw the door open when he was finally welcomed in.
He also told Scott Mason that he believed the sabotage to be a "personal attack".
His fellow housemates were less sympathetic, with Adam Kelly describing Benedict's plot as "f**king hilarious" and Luke Anderson declaring that it had "brightened up [his] day".
Benedict later admitted his actions to Lydia Louisa as well.