Hormonal Imbalance

Jenn and Julie are in an open relationship and Jenn does more than her share of taking advantage of that freedom. Something that doesn't bother Julie at all along as Jenn tells her all about her exploits in bed. An occasionally Jenn asks Julie to join her and one of her paramours. Most of Jenn and Julie's friends would have been shocked to learn they broke up suddenly after living together for a number of years.
Shocking too was the reason behind the breakup. A severe case of hormonal imbalance and someone's time of the month. Julie leaves Jenn with really nowhere to go. Packed and driving she remembers the English professor she helped with an animal adoption. At the time they first met Julie felt there was something about Marti, the professor that made her feel comfortable calling and asking for a place to stay for a few days.
Julie's guess was right, Marti eagerly accepted Julie and told her she could stay as long as necessary. Expecting it to be a pleasurable stay indeed.