The Virgin Vampire Only Drinks Milk

[Source of Power: Tits]
A fantasy romance about a vampire who can't suck blood and a cow beast-girl.
The vampires, who once threatened the lives of people, are now being monitored and managed by the church.
One day, Bell, a beastgirl cow, is partenered with Yuki, a vampire who can't drink blood.
Since Yuki can't drink blood as source of nourishment, he is so weak that he can't defeat monsters.
However, in a desperate situation, he asks Bell for milk…!
Instead of blood, breast milk. An unconventional breastfeeding smut begins!