Ore no Te de Ike ~Chikan no Hibi~

Main character molested a female student when he was 20 years old, but got beaten by her. He fell in love with her strength and decided to conquer her. Three years later he mastered his molester skills to deliver ultimate pleasure to girls and not ruin their self-esteem. Today he enters packed train like usual and sees the girl from three years ago...

[From vndbreview]