Stamina for days!

You smile. "Yes. That is what I'm saying." You watch as Amelia starts crying before her crying turns to laughing. She tilts her head up from your bare chest. "Should we keep this for at my place?" she asks you. You shrug. "I'm ready whenever. I'm not sure what they've been putting in my food but it's keeping me primed." you say laughingly.

You feel a familiar, silly smooth hand on your shoulder. "We put special fertility and stamina enhancers in your food to make you the ultimate cum producing machine in the world!" Vanessa says triumphantly from behind you. "You will never run out of cum to fill us needy and horny women, so even if you decide to not waste any time and go for another round immediately after you'll be ready to go almost instantly."

"We'll give you a few boxes of the stuff when you leave the hospital and whenever you run out you just come visit me." she says seducingly, nibbling on your earlobe. "Or anyone here at the hospital really, but I hope you will visit me either way. See how my belly is swelling." she says. You're pretty sure that's just cum and not actually a baby, but as the realisation of what she's saying hits you, you start feeling dizzy. The whole world seems to start turning and shifting but luckily the two beautiful, naked and half-naked women you are sandwiched between keep you from falling.

"I'm going to be a father." you mutter. Vanessa beams a smile at you. "Yup! And I'm going to be the mother of the chosen one's firstborn! I'll be famous!" she says cheerfully.

Amelia chimes in. "I wouldn't be so sure of that, missy. Maybe I will be the one becoming famous. You may have been the first to get fucked by him, but I might give birth before you." she says with a challenging smirk. "But to have the best chances at that I'm going to have to get fucked as soon as possible." she says. She turns to you with a lustful smile. "Are you ready for a second round?"

You smile at your sister's transformation from confused and unsure sister to lustful sex machine. "You heard her. I'm ready when you are." you say. You just barely get to finish your sentence before you are dragged into the bed, this time not with Vanessa offering herself to you, but your own sister. She puts a pillow up against the wall and places her head against it while lifting her bottom slightly and wiggling it enticingly at you.

You quickly get into position, wasting no time with foreplay, and place the head of your dick against her entrance. "Be careful. I don't have sex as often as your caretaker over there." you hear Amelia say.

Vanessa has climbed on top of the bed with you as well. "Hmm, a bit of a rebel, are we? Not following the 'Everyday Sex Law'? Bad girl." she says before roughly slapping Amelia on her butt cheek. Amelia lets out a shriek which is muffled by the pillow she's up against. Vanessa then winks at you and moves herself to be under Amelia, with her mouth right under Amelia's nipple.

As Vanessa starts licking and suckling on Amelia's breast as indicated by the soft moans escaping Amelia, you start applying pressure to Amelia's pussy lips. As they give way to the inside of Amelia's tight pussy, you hear her moans increase in pitch. You even think you can make out a few words from the muffled mess of words escaping her, as if pushed out by you entering her at the back.

You steadily enter Amelia's absolutely astonishingly awesome cunt. It wraps around your dick like a sleeve and her inner muscles tense up around it, massaging it from all sides. You feel like you could cum from just this sensation alone, but you decide to hold back for at least a little longer.

That is when you're conquest seems to hit a road block. Literally, something is blocking you from continuing on! "Sis? What is that inside your vagina? I can't go any deeper!?" you manage to say from between gritted teeth. Vanessa takes a short break from her sucking duty. "No way. Are you a virgin!? Oh my god! What!? But... HOW!?" she screams out excitedly and clearly astonished. For a moment she dives back underneath your sister before coming back up.

"I think she's saying you should just push on. If you're careful it shouldn't hurt too much. Just take it nice and slow." she instructs you. You nod. "Alright sis. Her I go!" you say before slowly applying more pressure to the barrier again. You slowly feel it starting to give way, until suddenly all pressure seems to fall away and you push in fully. You feel the tip of your dick hitting another barrier.

Amelia screams into the pillow which muffles it slightly but you still curl your fingers at the clear scream of pain your sister just let out. "I'm so sorry. I hope this will be worth it for you." you whisper more to yourself than anyone else.

After letting Amelia's twitching pussy calms down and adjusts to your size a bit you start making your way back out. When the tip of your dick passes the place the barrier had been, you feel Amelia's body tense up. She arches her back and her pussy clamps down on your dick with all its might. She screams as she has another orgasm.

You push yourself back into the unbelievably tight insides if your sister's snatch and when you reach the barrier from before your already sensitive dick can't take it anymore. Massaged by Amelia's spasming vaginal walls you reach your orgasm. You grunt as you shoot out a load comparable to the one you filled Vanessa with, but this time it's deep inside your sister. It's hot and forbidden, which only spurs you on to pump more and more of your baby batter into Amelia's womb.

After you finish filling up your sister you feel exhausted. Vanessa has stopped going to town on Amelia's poor nipples and is helping your only half-conscious form to rest besides your sister, instead of inside your sister. Amelia is already sleeping.

"I can't believe it. A virgin! And she lost it to her brother! This is such an amazing story, I should write about it or something." Vanessa says out loud while pulling the bedsheets over the three of you, before falling asleep.