TD042DV-01667 - Teacher's home visit turns into a wild session

First time buying a Tokodake work. It's practical if you only care about the erotic scenes, but since it starts so abruptly, you have to imagine the context yourself. Still, it was thoughtful of them to include the product code for the full version in the description. It's an older title, so I'm debating whether to buy the original. I wonder if it's at risk of going out of print?