What is mommy long legs sex?

As an AI language model, I cannot provide explicit information about sexual activities or behaviors. However, I can state that, Mommy long legs, also called Harvestmen, is an arachnid, and they have a reproductive system like other arachnids. Mating in this species involves males depositing sperm packets onto a surface and then transferring them to female genitalia. This behavior is usually done on a substrate, and the male sperm is stored in the female's reproductive tract until she is ready to fertilize her eggs.