koibito wa yawachichi onesan hokeni

Soichi is in love with Chitose, a school sick-room doctor. She is also Soichi's old friend. One day, Soichi's parents have gone abroad on business and Chitose volunteers to take care of him. They soon find out that they love each other and finally sleep together. Soichi isn't good at having sex, so Chitose gives him a sweet lesson....