He tried to will his cock into a more smoother cock, similar to his naturally puppy cock so as not to hurt her with those pesky barbs which were causing her so much pain. Maybe thats all it really needed, was to change the shape of his cock and it would be ore enjoyable. He was trying everything he could think of to make this hurt less. However the way her ass milked his cock and the way her ass pound against his hips, trying to make him explode inside her was already working.<strong>"Lisa... Im gonna cum soon! Brace yourself!"</strong>He warned her since that would probably be the hardest to endure. So much rich cum filling her bottom, and he began to cum hard inside of her letting rope after rope of hot sperm flood Lisa's backside. Meanwhile Nina was free to enjoy every single moment of her sisters foolish attempt to try and become more endowed. He howled softly and allowed himself to nut completely inside of her. He didn't knot her because that would just hurt plain and simple. Hopefully she didn't go feral. Hopefully she wasn't insane.