Grab the Diary...

You open the small book and find a very interesting calendar. It is color coded to keep track of her fertility. You note that today is right in the middle of her cycle as it is an nice shade of pink. It is somewhat anticlimactic that her actual Period is marked out in blood red.

You notice that the next few days are circled and the words NO SEX are boldly written and underlined. Your cock releases droplets of milky fluid as your arousal at the thought of her current state races throuh your mind.