Instead I reached up and grabbed her breasts. Pinched her nipples. I felt her pussy clench as I did it.
“God, I love these,” I said.
“I always thought they were too small.”
“They’re perfect. You’re perfect.”
Emily reached back and cradled my balls. Two could play this game apparently. “These are really full,” she said, “I don’t know if I’ve ever felt them when they’re like this.”
“Be careful,” I said, “They’re really tender.”
“Is all that build up just from me?” Emily asked, “I mean, you were unloading at least five times a day and then… Nothing. There has to be, like… God, at least 25, 30 regular cums in there.”
I groaned.
“You might give me quintuplets, all that sperm. Fuck. You’d better not cum in me, Ryan.”
“I won’t,” I said.
“I mean, just imagine, you think you’ve got it under control, then suddenly you slip and WHOOPS! There’s my baby brother’s baby inside of me.”
“You’re cruel,” I said. Emily just winked. I decided to try giving her a little scare. I flexed my penis in her pussy, almost like I might be cumming. She gasped, her face went white, and she even started to lift off a little. But then she laughed.
“Ohhhh, you almost had me there, big guy.”
“Worth a shot,” I said.
“You’ll be the first to give,” Emily said, “I just know you will. And then you’ll know that I’m the big sister.”
She bared down on my cock with her cunt, then laughed again. I groaned. I was getting close now. My need to explode slowly shifting from urge to reality.
“I’m like, really fertile now, too,” Emily said, “Like, I could probably get pregnant just from standing near some sperm today. My little egg is in my womb just waaaaaaaaiiiiting for some big bad Ryan spermies to come inside.”
I rolled my head back. All this talk was driving me crazy. I didn’t want to make my sister pregnant but my body did — my instinctive drive to reproduce didn’t care about college or disappointing my parents or any of that. It just wanted to make more mes and my big sister was telling it exactly what it wanted to hear.
I started to pant from all the pressure. The little spark of orgasm that started in the base of my penis slowly spread upwards.
“Getting… close…” I said.
“OOOO, yeah. I can feel that,” Emily said, “Your cock is like… swelling up inside me. Fuck. And I haven’t even touched my naughty little clitty. I’m telling you, Ry, I’m never going back to condoms. We’re going to have to find another way. This… this is just too good.”
She shifted her weight again, moved up more on her feet. Ready to spring off at the last second. She could see the cliff coming now and my crazy sister just slammed on the accelerator.
“My little brother’s going to give me his baby,” she started to chant, “My little brother’s going to give me his baby.”
“No,” I said, teeth grinding, “Can’t… Won’t…”
“Ready to give up then, little Ryan? Admit that your big sister is the best?”
Damn her. “N…no. Not yet.” I still had time, I could feel it. Maybe if we were actually humping I would go, but just sitting here, I could maintain control.
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