ね～つま ～ハッピーライフ＆Hレッスン～

Main character is a student who gets engaged with a female teacher. They are denied intimacy till graduation. They don't have a place to date secretly since both live with relatives and there's no money for hotels. So they decide to find suitable spots right at school. He is led by more experienced partner, but he wants to polish his technique. To do that he starts to date his childhood friend in secret. A double life of practice begins.

[From vndbreview]