Becky spent the afternoon experimenting with the symbiote in her vagina. It didn't take much playing with the green ooze to trigger her orgasms. Through experimentation she found penetration was still possible with the right approach. Her finger was snugly embraced and the symbiote touched her in the right spot in response.
Despite all her masturbation and orgasms, Becky remained horny. She called her boyfriend, Derek, and invited him to stop by after he got out of work. In the meantime, she took a short nap from her exhaustion. Becky's doorbell woke her up and she threw on a robe to greet Derek at the door. Once inside, Becky eagerly led Derek to her bedroom.
"Remember how I wouldn't have sex until I found a new form of birth control?" she asked. "It's your lucky day."
Becky dropped the robe to reveal her naked body and noticed an immediate bulge in Derek's pants in response. After a moment to figuratively collect his jaw off the floor, Derek asked the obvious question.
"Great, but...what's the green stuff?"
"Organic birth control."
That was enough of an answer for him. Becky and Derek began making out, slowly undressing him in the process. Then they climbed onto the bed where Becky found her breasts were extra sensitive. Whether that was some side effect, or just because she was horny Becky didn't know. After a little more foreplay, Becky helped direct Derek into just the right spot and he slid in.
"Wow, we're a perfect fit" he exclaimed and gave a few strokes, finding her perfectly slick.
"All thanks to this green stuff" she said.
It didn't take much before Becky was orgasming out of control, her best yet. That finished off Derek as well, but for a moment he found himself stuck as he pumped and pumped. Given his massive release he hoped this organic birth control was as good as Becky thought.