Princess Knight☆Catue DVD-BOX Special
Japanese title: カチュアアヘりイキ出産シーン
Type: Special
Episodes: 1
Source: Visual novel
Genres: Hentai
Studios: Studio 9 Maiami
Producers: Valkyria
Duration: 3 min
Rating: Rx - Hentai

DVD-BOX special added to the 3rd volume. It shows the events after the 3rd OVA.

(Source: AniDB)