This is a classic. Super hot and a constant re-read!
1st volume of the Kuroneko Kareshi Series
Order is as follows:
1. Kuroneko Kareshi No Asobikata
2. Kuroneko Kareshi No Amaekata
3. Kuroneko Kareshi No Nakasekata
4. Kuroneko Kareshi No Itoshikata
5. Kuroneko Kareshi No Afurekata
Kuroneko Kareshi no Asobikata