The mouse hunting & slaughter continues chez Allergic, count is currently 3.
First one the corpse hasn't been found, probably festering somewhere in the "junk room" upstairs.
2nd one was brought in still alive presumably as a gift from Girlcat to Boycat for him to practice on. Boycat managed to let it escape under the sofa that evening. Unmarked but decidedly dead corpse found on the floor yesterday morning.
3rd one was brought in last night still alive. Between them they managed to catch then lose it dozens of times (bastards); Boycat has clearly been learning well from his sister. He was actually GROWLING at his sister whenever she went close and it was in his mouth - first time I've ever heard an aggressive sound from either. Once the poor little thing was dead, they lost all interest so I removed the unmarked but soggy remains (Boycat is a bit of a dribbler).
Both cats spending more time sleeping & cuddling each other & me than ever before, and Boycat has developed a bit of a swagger!