Emma Carr, 38, sells sex on the internet under the name Jade.
The London Fire Brigade crew manager charges £300-an-hour to visit clients at their home or hotel room — or £250-an-hour to entertain them at her flat.
She also offers overnight “dusk till dawn” sessions for £1,300.
One website has raunchy photos of the brunette topless and in saucy lingerie. It describes her as “playful and seductively sexy” with a 32FF-26-36 figure.
During the day Emma manages 999 crews at Euston Fire Station in central London — in charge of teams on emergency call-outs.
Day job ... Emma Carr at fire station
She offered a Sun investigator a one-hour sex session at a central London hotel.
In the hotel room, Emma said: “We can do whatever you want — within normal bounds. I don’t have any whips and chains.”
She explained she charged extra “for things that are a bit more intimate”.
Raunchy pics ... Emma Carr's sexy internet pose
Describing her double life, she said ITV’s hit show about a hooker Secret Diary of a Call Girl starring Billie Piper was “spot on”. She admitted having a full-time job in “the public sector”, insisting she turned to the sex industry partly because of the low pay in her normal work.
Emma, from East London — believed to have been a firefighter for seven years — said: “The money helps me. I can go on holiday. I don’t earn very much in my other job. I just want a better lifestyle.
Red alert ... Emma Carr, circled, with fire team
“I was living on my overdraft before and now I’m not, which is nice. I’m very safe and I’m very careful. I work one day a week and occasional nights.”
She added: “I’ve always had a very male attitude towards sex. I can distance myself. I walk out the door and it’s not like it's going to dwell on my mind.”
Emma said her parents “disowned” her after discovering her secret life.
Our reporter declined her offer.