Milk Princess

Akira is a boy who became a hero after rescuing two princess sisters from captivity. In the Kingdom of Courages, where the breasts of adult women can produce milk, the highest form of hospitality, is to offer freshly squeezed breast milk, The queen, Christina, is a bewitching lady, the maid, Sherice, is cool and beautiful, and the princesses, Stella and Rosemary, are gorgeous, too. Akira will be given milk straight from the tits of all these beautiful women!

(Source: Nijigen Dream Bunko)