An OneeShota full color doujin manga.

My older cousin who was working in Tokyo has quit her job, and moved to the house across the street from ours. Until she finds a new job, she was supposed to be my tutor, but...

This is a story about a busty young woman making a man out of her younger cousin. The first half is from before his first ejaculation, and the second half takes place after it.

(Source: DLsite)