In tonight's episode, we'll see the pair kissing again and jumping into the pool, before they shower together nude and do a bit more snogging.
Cheeky Marco then slaps Laura on the bottom and she drops her towel.
In one way them hooking up again is a bit inevitable after *that* incident, in another, it's a surprise, as Laura was convinced Marco - who claims to have had a "hall pass" from his fiancee - was "washing his hands" of her following their sexual encounter.
She confessed to Lateysha Grace last night that she and Marco DID have sex, saying: "It wasn't full blown sex, but we had sex, basically. Straight after it happened he said 'OH MY GOD! What's my family and my fiancée going to say?'
"I was like mate, 'You can't say this now.' I think he feels guilty."
Laura told housemate Latesyha in private she felt as though Marco had now "washed his hands of me", prompting Latesyha to say she doesn't believe Marco really had a hall pass and she feels sorry for Laura.
Laura then told Big Brother in the Diary Room: "It doesn't mean I'm a home wrecker. I know the girl code, if a girl's got a boyfriend you would never get with that guy. Marco should start getting a bit of stick, he's the one who is in the open relationship and told me he is. When I leave this house the truth will come out, I really hope he hasn't lied to me."
Earlier this week, Marco's fiancee Kim spoke out on Twitter, saying: "Fyi I said #hallpass NOT open relationship. I don't watch bb, but I heard this today. Worst thing I can't even talk to him #bbuk #bbmarco (sic)."
Marco and Laura's steamy antics drew more than 250 complaints earlier this week, when scenes showing them getting so hot and heavy were aired, leaving viewers questioning whether they had sex. (Laura then confirmed they had.)
An Ofcom spokesman told Mail Online: "We will assess these complaints before deciding whether to investigate or not."
A BB spokesperson has declined to comment.
Meanwhile, it seems Marco and Laura's flirtations haven't endeared them to the rest of the house, as during tonight's nominations, Jason doesn't seem too impressed...
Nominating Laura, he says: "The getting together with Marco after a couple of days, they're two adults and they can do whatever they want... If you're touching each other explicitly in front of people after a short time, then sometimes you've just got to draw the line"
We'll find out who is up for eviction when Big Brother continues 10pm on Channel 5.
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