Breath of Fire II: one of the female party members(katt) grown atached to the protag the female character being a monster girl love is mutual and canon

Lunar: Silver Star Story complete/Harmony: can't elaborate its a heavy spoiler.

Lunar 2: Eternal Blue Complete: can't elaborate i forgo.

Rune Factory 4: Includes monster taming features on your farm.

Monster Girl Quest: Great story and unique character designs.