I am not expecting an easy match either but Leverkusen still remains the favourite here. Dortmund might not want to concede to Leverkusen that easily but from the performance of Leverkusen this season and their recent winning streaks Dortmund will just have to prepare twice what they would have done on a normal day.
A draw is also visible but I am not too sure Leverkusen will want to stain their position in the table. I mean the need to keep their winning consistent so the stand a big chance to contend for the title this season.
It is a big match, and I don't think anyone will expect the game to be easy for either of the team. Even if we judge based on their performance, both Dortmund and Leverkusen are playing well. However, the only difference is that Leverkusen are on a winning streak. Still, that doesn't guarantee they will beat Dortmund.
These kinds of matches are always unpredictable because anything can happen. Both teams are strong, and each will prepare well for the match, as it holds significant importance for them. Let's just see what happens in the match. If I were to predict, I would say the game may likely end in a draw.