Sunday Life revealed this week that the pair create explicit adult content on OnlyFans together, some of which was filmed in their Cabo Roig pad near Alicante.
Ms Allen, from Newtownabbey in north Belfast, advertises the content on social media under the name Madi Alia Allen, posting dozens of sexual images and videos.
She teases some of the content to her 1,600 followers on X, with her bio reading: “Your new fav, hot 5ft brunette content creator, click to see all my spicy content.”
Subscribers can pay to access her OnlyFans page for £15 per month, where she posts uncensored content.
Many of the adult clips feature her older boyfriend Mr Smyth, who was a close friend of John George, also known as John Hardy.
She describes herself in her bio as: “Your favourite little sweet sexy 19-year-old living in Spain.
“5ft green eyed brunette what more could you ask for... subscribe to see the naughty side of me. B/G (boy/girl) and plenty more!”
Speaking in a TikTok video last week, Ms Allen said she was “sick and tired” of all the rumours about John George’s disappearance and said that she had nothing to hide.
“I have not been hiding or fleeing. I’ve been where I am right now. I’m not far away from my house,” the 19-year-old said following a two-week break from social media.
“I’m just coming on (to social media) to clear up some rumours that I’m sick of hearing. I’m not running, I’m not fleeing.
“The police back home have advised me to stay here until it is safe. I can’t go back to Northern Ireland because my whole family is in danger - and even more so me.”
Miss Allen claims she has had “30 death threats” issued against her at home and in Spain but didn’t say who had made the threats.
“Police advised me to stay safe and while I’m here, staying safe, I have told the family every bit of information I know.
“The British police know I’m helping and I’ve got nothing to do with it.
“But right in this moment in time, no one is safe, especially me, until John is found, so I pray he’s found, I really do, so my life can go back to normal and we can get back to our dogs.
“The other rumour I want to clear up is that my dogs have not been abandoned at all. Never in my life would I do that.”
“We only moved house for our dogs,” she said, adding that the six XL Bullies she owns are with the police.
She continued: “I asked (the family) did they want me to tell the Spanish police what I told them and they said yes.
“So the Spanish police were (called) and I’m also waiting on them ringing back.
“They don’t want to meet up with me, because they know I am safe here until John is found.
“No dogs have been abandoned, no one’s fleeing the country. Hopefully John is found this week. Please say a prayer for his family.”
Ms Allen’s partner Jonny Smyth has also been in contact with John George’s family since his disappearance.
John’s sister Courtney George previously told the Belfast Telegraph: “I contacted Jonny and asked him, ‘Do you know where my brother is?
“He said, ‘No, me and him went our separate ways, I don’t know where he is, I think he went to meet boys out in Benidorm’.
“I just got a bad feeling about it and went back to Jonny who said, ‘I don’t know where he is, all he wanted to do was drink and I have a business to run’.”
Interpol is now working with Spanish police to investigate the disappearance and suspected murder of Belfast man John George in Alicante last month.
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