How can a repentant husband please his wife and atone for his sin after harassing his wife's unveiled sister?

You must hasten to repent to Allah by abandoning the sin, feeling remorse, and resolving never to return to it, while avoiding the causes of disobedience, cutting off paths leading to it, and being wary of following the footsteps of Satan. You must fear Allah and be cautious in dealing with foreign women by lowering your gaze and avoiding temptation. You must conceal your sins and not inform your wife or anyone else of your disobedience. A sincere repentance is accepted, for Allah accepts the repentance of His servants and forgives all sins. You must seek to please Allah and achieve true repentance, making it clear that repentance erases what came before it.