The Messenger of Allah ﷺ used to kiss her while he was fasting and suck her tongue.
حدثنا هشام بن سعيد قال أخبرنا محمد بن دينار عن سعد بن أوس عن مصدع بن يحيى الأنصاري
كان رسول الله ﷺ يقبلها وهو صائم ويمص لسانها
Its isnad is sahih. Musadda Abu Yahya is trustworthy, his hadith is found in Muslim and the four (Sunan compilers), though Ibn Main did not know him and some others criticized him. The hadith was mentioned earlier at 24797.