The Messenger of Allah ﷺ used to kiss her while he was fasting. He paused for a moment, then said, "Yes."
حدثنا سفيان قال قلت لعبد الرحمن بن القاسم أسمعت أباك يحدث
أن رسول الله ﷺ كان يقبلها وهو صائم فسكت عني هنية ثم قال نعم
Its isnad is sahih. Bukhari narrated it, 4/152, no. 1928, Muslim, 7/762, no. 1106, Abu Dawud, 2/311, no. 2382, and Tirmidhi, 3/97, no. 727, and he said, hasan sahih. All of them in the chapter on fasting.