Kaffarah for discharge while reciting Quran and thinking of intercourse?

I had a very embarrassing situation and need clarification please. A couple of days ago, I had a discharge of clear white liquid while reciting the Holy Quran. First, I thought it was a waswasah by Shaitan and I carried on reciting the Quran. After finishing the recitation, I checked my private part and could see a clear fluid about to come out of the private part. So, I washed the private part, performed wudhu again and repeated the recitation of Holy Quran. The discharge happened because my mind was diverted during the recitation and I was thinking about having intercourse with my wife after the recitation. Please advise if I have to pay any kaffarah and how can I make taubah?