Morbidly obese Monica Riley tips the scales at a whopping 50 stone.

But unlike most overweight women, Monica is not interested in trying to slim down.

Instead, she plans to gorge on fat and sugar-laden foods until she is so big she is bed-bound and totally dependent on her boyfriend Sid to care for her.

And in a sinister twist, Sid is actively encouraging her bid to become 70 stone in order to become the world's biggest woman.

While most men would want to discourage the woman they love from putting her life at risk, the 25-year-old warehouse worker has set himself up as Monica's feeder, preparing meals for her and even using a funnel to feed her special weight-gain shakes made from blended Pop Tarts when she is too tired to chew.

Monica being fed ice cream by her boyfriend, Sid

Monica being fed ice cream by her boyfriend, Sid

Monica, 27, insists the pair get a sexual kick out of her size and still manage to have an active love life despite her 91-inch stomach and round-the-clock snacking.

She says: "The plan is to reach 1,000lbs and become immobile. I would feel like a queen because Sid would be waiting on me hand and foot and he's excited about it too.

"It's a sexual fantasy for us and we talk about it a lot. He already has to help me get off the sofa and get me out of bed.

"If I lay down after a big dinner he has to help me roll over because my belly is too full for me to roll – it's a big turn-on for both of us.

Monica preparing to funnel feed

Monica preparing to funnel feed after she's eaten so much she can't fit anything else in

"People may not understand it, but I'm addicted to food and I want to become immobile by the time I'm 32. Sid would have to do everything, even washing and changing me.

"I love it when he lavishes attention on me and we have a great sex life. Sometimes I go on top – he's so strong he can handle it."

And despite their controversial plans and her growing inability to look after herself, Monica – who now leaves the house for doctor's appointments – claims the couple are currently trying for a baby , which she intends to raise from her fat-bed.

She says: "We do plan to have children – there's nothing to stop me raising a child from my bedroom.

Monica posing with her boyfriend, Sid

Monica cuddles her boyfriend, Sid

"We would get a nanny in to help around the house and take the baby out and about.

"There's nothing to stop us raising a child. Some people might think it's selfish but I'm confident we would be good parents.

"If I need to I will put my weight gain on hold to get pregnant but I'd want to put it on again afterwards."

Monica grew up with her parents and seven siblings in Fort Worth, Texas, and has struggled with her weight all her life.

Two years ago at 28 stone she was preparing for bariatric surgery to help her lose weight but changed her mind at the last minute and decided to embrace her gigantic figure.

Monica and Sid posing at home

Monica and Sid in their home

She also realised that her size could be lucrative on the internet and started posting naked videos online for men, charging £100 a time.

And by the time she met Sid on Facebook in May she had ballooned to 46 stone.

"Sid said I was pretty and was turned on by my flab. We met up and I told him my weight-gain plans. He was supportive and we moved in together two weeks later."

Since meeting average-built Sid, her plans to hit 70 stone have been ramped up a notch and he has helped his girlfriend gain almost four stone by cooking for her and feeding her up to 10,000 calories of food a day.

Monica says: "The bigger I get the sexier I feel. I love my big soft belly and stuffing myself with food really turns me on.

Monica posing in her lingerie with Sid

Monica posing in her lingerie with Sid

"Sid loves to cook for me and hand-feed me and I've achieved so much since we got together. He feeds me around the clock and I never have to get up to do anything."

On an average day, Monica will eat six biscuits (American scones), six sausages in a bread roll, a big bowl of sugary cereal, two weight-gain shakes, four McChicken sandwiches, four double cheeseburgers, large French fries, 30 chicken nuggets, macaroni cheese, Taco Bell takeaways and a gallon of ice cream.

Monica says: "My mum doesn't understand it at all and she says I'm killing myself.

"I understand her concerns but it's my life and gaining weight makes me happy.

Monica on her 17th birthday

Monica on her 17th birthday

"I do worry a little bit about losing my independence but I know Sid loves taking care of me and would never let me suffer."

Sid, who is 6ft 2in and weighs 15st 7lb, is also defensive towards their critics, insisting he is simply helping Monica achieve her dreams.

Sid says: "There is a misconception that feederism and immobility is about control but that's not the case.

"If Monica wanted to stop I would accept her decision without question. I wouldn't see caring for Monica as a chore at all.

"I love her and I love doing things for her - caring for her would be a dream come true."

Monica in her early teens with her mum, Terri

Monica in her early teens with her mum, Terri

To help Monica reach her goal, Sid prepares a special shake for her to drink through a funnel.

It consists of 10 Pop Tarts, heavy cream, ice cream, milk and weight-gain powder, totalling 3,500 calories a go.

Monica says: "The funnel feeding is what I really look forward to. I find it to be a very sexual experience and I know Sid likes it too.

"I now have 20,000 online fans and they love to watch the funnel feeding – it's a big hit."

And regardless of the health risks, Monica and Sid are going ahead with their mammoth quest.

Sid says: "I am worried about her health. But ultimately it's her body – it's her choice, not mine.

"Even if I'm not here she's going to do it and I love her so I'm going to help her out however I can.

Monica preparing to funnel feed

Monica preparing to funnel feed her gigantic 3,500 calorie meal

"She set the goal of 1,000lbs, not me. I do feel some responsibility but I'm helping her achieve her dreams.

"If her health does suffer I'll be here to care for her. I love her and I want to look after her."

And although well aware of the risks she is taking and the burden she is putting on her size 38 body, Monica is continuing against medical advice.

She says: "My doctor knows what I'm doing. He was shocked but it is my body and my decision.

"Despite my size I'm actually in pretty good health. I do get breathless walking up stairs and I struggle with getting around but I don't have diabetes or high blood pressure. I have regular health checks.

"I know I risk health complications as I get bigger but I'll deal with them when they happen.

"I could get hit by a car tomorrow and my life would be over. At least if I die this way I will have lived out the life I wanted."

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