The relationship between “Pharma Bro” Martin Shkreli and his gay, well-heeled investor may have been less “platonic” than the shareholder is letting on, according to a steamy email revealed Wednesday.

“Only if I can touch your soft skin,” Steven Richardson emailed Shkreli when asked if the two could meet up to discuss a failed drug trial.

The email, read by defense attorney Marc Agnifilo for the court, unsettled the 63-year-old, who shakily responded​ from the witness stand,​ “It’s on an email?”

Richardson grew progressively redder as he looked at the comment, which he sent to Shkreli at 9:21p.m. on March 29, 2010.

“Yes, my recollection is he’d had an infection on his neck and ear,” the former American Expres​​s HR Vice President eventually spluttered. “It was a very nasty looking rash.”

The 63-year-old​ ​—​ ​who told jurors Tuesday he was in a happy, long-term domestic partnership​ ​— then sat growing more and more uncomfortable in the hot seat as prosecutors attempted to squash the line of questioning at sidebar.

Shkreli sat calmly taking notes during the entire exchange.

But Brooklyn Federal Court Judge Kiyo Matsumoto allowed the examination, and Agnifilo then turned the ​cross examination to bubble baths, which came up in another email Richardson had sent Shkreli–in response to a daily performance report.

“I might have said​,​ ‘​G​o and have a bubble bath, make yourself feel better,” the investor admitted, acknowledging Shkreli’s frequent headaches and depression.

Jurors also heard that Richardson bought Shkreli “gifts,” as he agreed with Agnifilo that his client was not “a very fashionable person.”

“I think they were mostly clothes,” he told the court, echoing testimony from Tuesday in which he said the 34-year-old looked up to him as a “mentor.”

When Agnifilo asked about Richardson’s interest in Shkreli’s health​, the dapper investor again brought up the then-hedge fund manager’s “rash​,​”​ ​saying it “may or may not have come from the sleeping bag” Shkreli used when he slept at the office.

“Didn’t he tell you many times that you made him happy?” Agnifilo asked Richardson, referring to an email exchange discussed Tuesday in which the two men wrote “love you.”

“Didn’t he refer to you as a blessing in his life?” Agnifilo queried. “I don’t recall that phrase,” the lender said tersely.

“He told you to your face that he loved you,” the lawyer said. “And you wrote it in an email.”

“Again, loving and caring as a friend,” Richardson shot back.

“Only as a friend,” Agnifilo responded. “Yes,” Richardson said.

Richardson testified Tuesday that Shkreli had repeatedly brought up “hooking up” with random men in an attempt to get close to him.

He said Shkreli stopped after Richardson brought him into his bedroom in March 2010 and confronted him.

“Do you have any physical feelings for me?” Richardson probed that night. “He took a second and said, ‘No, I like you a lot, but I don’t.”

Richardson walked away from his encounters with Shkreli​ ​— who prosecutors claim used his hedge fund as a piggy bank to fund his burgeoning pharma company​ in what amounted to a Ponzi scheme ​— with $2.3 million.

He originally invested over $400,000.