We're having a horrible problem. We collected our Tonkinese kittens this evening, they're 14 weeks old and brother and sister. The breeder commented that our boy has is very large for his age and has large testicles, she said we'd have to have him neutered at 5 months not 6 because he is so well developed.

Our boy mewed all the way home. When they finally ventured out of the carrier, the boy walked around like he was desperately looking for something (we assume his mother because he was a mother's boy, only boy in litter of 7) and mewing very loudly and aggressively. Then he started biting his sister's neck. When we went to bed soon after he kept biting her neck and trying to mate her.

We phoned the breeder who said it was playing and that she would probably try to mount him too, it wasn't anything real. However I wasn't convinced and watching them, it's definitely real. I keep dragging him off by his scruff and I saw his penis out a couple of times. She keeps encouraging him too. It's now almost 4am and they're still trying to do it all the time. We're exhausted and worried and just don't know what to do. Please please help. We don't want to separate them into different rooms because they're in a new place and from a large litter with a mother and a loving auntie and I don't think they'd cope for the night without each other.