The pair's under the duvet kissing had apparently gone unnoticed by a lot of the group, including Chris R Wright and Ashleigh Coyle.
Following last night's row between himself and Mark, Christopher accidentally revealed their previous night time antics following a joke from Ashleigh.
After chatting things out with Mark, he told her and Chris: "He's calmed down. That was a bit ridiculous."
As Ashleigh jokingly asked if the the pair had kissed and made up, Christopher replied: "What, then?"
"Have you ever?!" the pair reacted.
"Oh Mark, Mark and I have.... have. I shouldn't have said that," Christopher explained. "Yes we did, shh.
"Do not dare tell him that or he will die. Literally."
Chris admitted: "I wouldn't want to be the person who said that, I wouldn't want to be."
As Ashleigh pulled Christopher down onto the bed to get all the gossip, Mark walked into the bedroom and quickly put a stop to the conversation.
BBUK airs tonight at 10PM on Channel 5.