So something was really bothering me about "the girl's" tail shape. She had popped female twice. It looked like a male tail to me, though, as a yearling. So I probed the snake, and I was correct, the tessera is a male. Which has caused upheaval in plans! Fortunately, I had a nice female saddle-pattern bloodred left, so there is still a pair
Lesson of the day!! It's not a female until it pops female a minimum of THREE times, or lays eggs

I'm so glad I caught this before it ruined someone's breeding plans...
Lesson #2 of the day- when you get snakes, if the sex matters, resex them yourself immediately!! Breeders, even big-name breeders who have sexed hundreds of babies, can have a male slip through as a female. This has happened to me THREE times (and I've gotten a mis-sexed, or more likely, mixed up with a sibling, female once) It's much easier to fix now (when hopefully the breeder has a replacement) than finding out when you're trying to breed two males...