Sunan an-Nasa'i - Book 1, Hadith 283
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It was narrated that 'Aishah said: "I would drink while I was menstruating, then I would hand it to the Prophet (ﷺ), and he would put his mouth where mine had been and drink. And I would nibble at the bone on which some bits of meat were left while I was menstruating, then I would give it to the Prophet (ﷺ) and he would put his mouth where my mouth had been."
How the Prophet ص modelled this behaviour here
Affection & Tenderness
“I would drink while I was menstruating, then I would hand it to the Prophet (ﷺ), and he would put his mouth where mine had been and drink.”
Openly expresses love, affection and tenderness to his wife through warmth, closeness and kind gestures.