Not all heroes wear capes — some wear nothing at all.

An OnlyFans model saved the life of a paying subscriber after noticing his testicle gradually growing bigger during their raunchy video calls.

Belle Grace, who hails from England and makes up to $50,000 a month posting kinky content online, told Yahoo Lifestyle that she started talking to the anonymous man about two years ago.

The pair would frequently chat via video, before she noticed one of his testicles slowly swelling up over the past six months.

“I said honestly, ‘I do think you should get it checked out.’ And it took me about four, five weeks to actually convince him,” the cyber model stated.

“He did turn around and say, ‘Look, I’m really embarrassed about it. I don’t actually want to go,’” the racy redhead recalled. “I said, ‘Honestly, just go, you’ll be fine. Just get that peace of mind that everything’s OK.’”

Grace had been chatting to the unnamed subscriber for close to two years — and would frequently see his private parts during their raunchy video calls.Instagram / Belle Grace

The raunchy redhead — who previously worked in health care — insisted that the man see a doctor after she noticed his testicle swelling up.

Grace was subsequently stunned when the man went to the doctor and was diagnosed with an “aggressive form” of testicular cancer.

Medics immediately operated on the man, who says he never would have sought treatment without Grace’s persistence.

The unnamed OnlyFans user — who is now cancer free — also spoke to Yahoo Lifestyle, saying: “I can’t thank [Grace] enough for encouraging me to make the doctor’s appointment. I honestly didn’t think anything was wrong.”

Grace was left stunned when the subscriber was diagnosed with testicular cancer, but he was able to be successfully treated.

The OnlyFans sensation makes about half a million dollars a year by posting kinky content for paying subscribers.

Prior to becoming a top creator on OnlyFans, Grace worked in health care — meaning she was attuned to changes in the human body.

The bombshell says she loved her job and only joined OnlyFans as a side gig in order to supplement her income.

But she says she was forced to quit her conventional career after a co-worker uncovered her racy account and started sharing it around her office.

Grace loved her career in health care but was forced to leave when her secret OnlyFans side hustle was made public

But the beauty got the last laugh and now makes around 10 times as much as she did in the health field.

Grace is in the Top 0.1% of OnlyFans earners, bringing in between $40,000 and $50,000 a month, meaning she nets around half a million dollars each year — and she’s saving lives in the process.