They had a new sex education teacher that the girl’s mother had hired. She was a very professional woman who made her students always comfortable. He needed to take measurements to make a calculation of his size and how that affects sexual relations and took the girl to another room to measure it. He asked her to undress completely and measured it everywhere.
Then it was the turn of the boyfriend who, when he started to take off his pants, said no. The girlfriend to hear how her boyfriend was screaming she came out naked and told him nothing was wrong. When the teacher pulled his pants down and pulled out his cock he began to give her a blowjob surprising his girlfriend. She told her that this was the first lesson because if sex starts with a good blowjob it is much better.