Rich elderly man with odd request

"Good evening" he says. I eye him up and down. He looks to be about 70 years old but doesn´t look age weary in the least. He´s wearing a simple grey suit with a white shirt and bright red tie.

"Hi." you reply
The elderly man continues. "Look, I´m not here to buy your services for myself. It´s for my 19 years old grandson. He´s recently come out as gay but he´s a Virgin, and somewhat debauchorous in his fantasies. You have a good reputation, so I´m trusting you to make his first time special."

I process all this and summarise. "So, just to make it clear. You wan´t me to take your grandssons virginity?"
He looks a bit embarrased. "Yes, that is quite right. With you I know he will enjoy himself and not end up getting or abused."

I ponder the proposal. Seeing this, the man pulls out 4000 dollars. "Half now and half when you´re done. I´f you come with me now. My car is around the corner."