I've had my females since 2009, they are 7,7, and 6 years old now. Tink is spayed, Sapphire is not yet. She's in heat, and has coerced Tink into mounting her.
They always just ignore each other, or they did untill today. They all get along well, no major fighting or anything like that. My question is will they start fighting... is this 'play' a warning I should heed?