Do you have a close-up photo of a few of the leaves? My first thought when I saw yours was Poellnitzia rubriflora since I coulnd't see any tubercles in the photo. A close-up of the leaves would help rule out Astroloba...

Hope this new picture help you. I'll try to get a closer view of the leaves this evening. (Just click on the link below to access to the new picture). Thank you, joscience!

Here is a link that might be useful: Astroloba?