Their romance may seem written in the stars now, but back when Ashton Kutcher and Mila Kunis were just costars on That ’70s Show, Ashton says things between them felt pretty awkward.

Ashton told his side of the Mila-Ashton story in a recent interview with Howard Stern, recalling his first on set kiss with Mila when she was just 14.

If you recall, the two starred as Jackie and Kelso on the hit show, and their first on-screen kiss was Mila’s first real-life kiss too.

That ’70s Show debuted all the way back in 1998, and at the time, Ashton considered Mila to be like his “little sister.” Discussing their sweet beginnings with Stern, Ashton said, “We’ve known each other for 20 years. I was 19, she was like 14. I did her chemistry homework for her. I think I was her first kiss, like, on the show. We have our first kiss memorialized on a TV show!”

Although young Ashton didn’t have feelings for young Mila just yet, he revealed that she did have a bit of a crush on him, saying,

The two remained friends until many years later, when they were both single and reconnected at a party, according to Ashton. He said,

Their second first kiss happened at the end of the evening, with Ashton adding, “I think it was pretty mutual — it was kind of obvious that things were happening.”

UGH, these two!