This is the conclusion of a two part story. Although this story stands on its own, you might be interested in reading the first part, Wet Miranda's Sperm Swap.

The story so far: I am having group sex with my boyfriend Rick, my friend Donna, and her boyfriend Sam. Donna and I are exploring a kink called sperm-swapping, which is the act of sharing come. Donna gave my boyfriend Rick a blow-job. Instead of swallowing his come, she dripped it into my mouth before we French kissed; then I swallowed my boyfriend's come out of her mouth. We then switched partners, and I gave her boyfriend Sam a blow-job. Finally, I dripped Sam's come into Donna's mouth before kissing her and then watching her swallow her boyfriend's come out of my mouth. For the next round, Donna wanted to simply switch partners and do the same thing again. I had a more kinky idea, which you will soon be reading about...