You decide to observe your cousin's changes after that small exploration that happened in the bathroom. Walking into your room, you see her playing the sims. You go sit down beside her and check on her. Her legs seem to be wide open and a small bulge can be seen on her skirt. Just masturbating minutes before, and now seeing such a sight caused something to tick in you.
You walk to the filing cabinet, slightly unhinged and still looking for more, you swap Millie and Vicky's genital documents, with Vicky now having your old cock. You also decide to swap Millie's boobs with your own flat chest, giving you small but still noticeable A cups that are now held up by your baby bra. Walking up to the sofa, you grab Vicky's hand, giving her a slightly alluring look. Her wide and inviting hips have now been strained with your cock. The sight of her yoga pants bulging with your cock just made you needier and needier. With her hand in your grasp, you bring her to her room, lock her door, strip off your clothes but the baby bra and the panties, and then sit down on the bed with a pleading face.
"Looks like my baby girl is needy."
She pulls down her yoga pants, revealing around a 5 inch cock hidden beneath her white panties. She slowly walks towards the bed, looking at you with an intense desire. Her hand pushes you down to a very exposed position. Seems like your dynamic has shifted slightly after the change in assets. After a long and passionate kiss, she brings her hand to your crotch. Finger in, finger out. She slightly grazes your clit and you buckle your hips. She makes you sopping wet and then positions you on top of her.
"Put it in me," you plead to her.
"You finally gave in, huh? I'm finally taking your virginity!"
I guess having your cousin's vagina also meant that her purity is also yours. It's such a shame that you're receiving her first for her though. Vicky excitedly aims her throbbing cock into your small pussy. She slowly pushes in and a sharp pain stings the inside.
"Oww... That hurts."
"Oh shit, I'm sorry. Do you want me to stop?"
"No- no... It's fine. Just give me a little bit."
After a short while, the pain subsides, and you tell her to proceed again. Vicky's cock sliding in and out of your tight pussy felt so good yet feels so cursed. The rhythmic pulling and pushing just got you almost hypnotized as the pleasure waves through your body. Despite your small orifice, there's just enough resistance to the cock to get your body to join Vicky's movements. You keep shaking every time she hits your cervix, clamping down more and more on her stick.
"It's coming, babe."
You feel Vicky's cock get slightly fatter while her movements get faster and rougher until you feel her shudder and stop. Warm sticky cum flow into your prepubescent vagina, or was it an adult one? You barely can think about it. You notice a warm glow-like feeling in your body as if you've been enlightened and reached nirvana. Your girlfriend hugs and then smothers you in kisses as you just smile, being paralyzed from the amounts of pleasure you received.
"Did you like that, babe?" She asked while bringing you into her embrace.
"Ye- Yeah... That felt really nice." You say, almost stuttering.
She hugs you one last time and then stands up and puts up her yoga pants. The sight is still pretty bizarre but got you feeling something since your nipples are hard.
"Are you gonna stay there, John?"
"Yea, I'll just take a moment."