Christinus, much like other geckos, are breeding machines. Year round of keeping them together wouldn't stop them breeding in the appropriate season. I regularly see them in the dozens across only 3 or 4 trees all in close vicinity. In the warmer weather, I see plagues of the little devils.
Remember when breeding these animals that they produce round, hard shelled eggs unlike other geckos like Nephrurus and Oedura, this means they require a tad more calcium as the eggs drain alot of what the female has. It would pay to leave a dish of calcium powder in the enclosure.
Being hard shelled, the eggs do not require the same incubation medium of soft shelled eggs. Therefore, no 1:1 mediums of substrate to water are required. Little, if any water needs to be added to the medium, be that soil or perlite etc...