Onegai Teacher
From Animepedia
sorry about system, on dsi. Onegai Teacher
Onegai Teacher, or Please Teacher is an Anime show that you can watch on certain websites or Youtube it is a lovestory about a Alien, [i don't agree she is an alien because she just comes from a different planet] named Mizuho Kazami who becomes a teacher on earth, and Kei [Kay] Kusanagi who eventually get married to keep her secret. They eventually see her parents at the house, where Mizuho's mom rapes him, [doesnt rip off underwear for those of you who are skittish] chains him to the bed and, you'll never guess what happens next, she takes a shower coming out dropping her towels and getting on top of Kei. Then Mizuho busts in the door [that means F'ing bad trouble] and afterwards lays on the ground sobbing and saying You tried to have sex with my mother! The rest is for you to find out the rest...XD