Feeling more viscerally connected to his sister than ever, stunned by the sheer magnitude of the pleasure that she was giving him by hugging and massaging and tugging on his aching hardness with her soft dick-engulfing rectum, Tyler felt his long-denied ejaculation suddenly boil over with undeniable urgency. Even as his seed started to surge along his raging boner, Tyler tried to move his hips back and forth in an attempt to actually fuck Michelle's ass at least a little bit before he filled it with cum, but he couldn't do it. Slippery with lube as it was, his sister's climaxing anal sheath was just too tight, her velvety smooth...