One thing you have to understand is that this game has a high feminist content, the game makes it visible in ALL the endings, that whoever wrote the script intentionally made the Hero get screwed in all the endings, in some more than others less. The answer to your question is no, there is no way for Hero to be with Sparrow, there is a way to have sex with her in the orgy organized for the ambassador of Nabia, she even supposedly gets pregnant by Hero, but even though she shows signs of interest in Hero, she prefers to stay with her husband and raise the child as if it were her husband's child.
