Haruka is one of the few that you DO NOT rape.
You treat her to dinner, maybe some drinks, make her feel important you (as she should be). And if things begin to get hot and heavy, you must take your time with her. After all, there's no need to rush, you have all night together.
Don't mistake her banchou exterior, she is very delicate, and so you must treat her as such...delicate, precious, with the utmost care and gentleness.
And when the time finally comes for the climax of your ritual of lust, one can never be too selfless with her, you bring her to fruition first before you even fathom releasing your seed of manliness.
To even consider any other course of action with Haruka is not only wrong, it borders on heresy.