As reported back in August, the Weatherfield duo will sleep together later this month, in what are expected to be the soap's raunchiest ever scenes.
Speaking to the Daily Star Sunday, Thomas explained: "In all the years I've been at Corrie, I've never had a reaction quite like it. Everyone remembers those scenes where Rosie Webster tried to seduce Tony Gordon wearing that basque. Well trust me, what she gets up to with Jason is even hotter.
"There's stripping and all sorts of naughtiness between these two. I've never known a reaction like it. A lot of people who have watched the scenes keep telling me how amazing Jason and Rosie are together."
Pondering the pair's long-term future, he continued: "Rosie is very feisty and poor Jason hasn't been very lucky when it comes to matters of the heart, so it's going to be interesting to see whether or not they'll go the distance. All I know is that the bosses like us together, so it's definitely going to go on for a little while yet."
Helen Flanagan, who plays Rosie, recently said that she was pleased with the forthcoming scenes, describing them as "all fun".