Judging by a sneak peek at next week's episode, it looks like things are hotting up for the pair.
Despite their ongoing romance, Aaron and Marnie haven't actually got round to doing the deed, but that could all be about to change as Marnie reveals: "I'm finally having sex with Aaron."
Fans will know that romance has been blossoming for Marnie and Aaron ever since she returned to the house in series twelve of Geordie Shore.
Marnie had left the show after filming in Greece, as her then-boyfriend Ricky Rayment had proposed to her. Their engagement didn't work out, however, and Marnie made sure to surprise her co-stars by coming back to the show.
Naturally, it wasn't long before she and Aaron picked things up from where they left off - but it wasn't plain sailing. Marnie was fuming when she heard he'd had newcomer Chantelle Connelly's name tattooed onto his wrist and later clashed with Aaron when he got a fake tattoo of her name put onto his back.
They did manage to clear the air, though, and fans saw Marnie and Aaron confess they love each other. In last night's episode of Geordie Shore: Big Birthday Battle, their romance was still going strong.
Marnie and Aaron arrived at the house together, with Marnie gushing: "I feel very confident with the place that we're in at the minute. I just hope we can carry it on."
Aaron, meanwhile, reassured Marnie: "I'm not gonna go and pull. We'll see how things go and maybe we get to have sex."
Marnie teased: "If you're a good boy maybe."
Their close relationship has left their co-stars confused, though. Sharing his thoughts on Marnie and Aaron's romance, Gary asked: "Why aren't they making it official? Why aren't they boyfriend and girlfriend?!"
He explained: "For me, the best thing to happen for Marnie and Aaron would be for them to give it a go. Aaron has said he's not seeing anyone else, Marnie quite openly says she likes him."
Geordie Shore: Big Birthday Battle continues Tuesday 17 May at 10pm on MTV.
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