Kenichi Tajima was an average "freeter" or freelance part-timer.
He lived on his own at the moment.
He had no girlfriend, so after work he spent all his time online.

Today he'd won a small lottery jackpot, good for casual shopping.

How should he spend the money? He scrolled through his bookmarks.
Ah, "SisDeli", an escort service that catered to guys like Kenichi. Guys with an elder sister complex.

Kenichi had always been fond of his real older sister.
He'd fantasized about her many times and from high school he masturbated into her soft, feminine panties.

SisDeli was a perfect choice. He'd always wanted to try this.

There were two courses: Standard and Special

He entered his "order" with nervous excitement.
Now to make the phone call. This was happening. Here we go.

[From DLsite English]