Suck it. Start slowly.

He wanted nothing more than to make her cum. To taste the wonderful substance he was sure his sister had. What else could she have? With something so big, unique, massive, juicy, and powerful. He wanted to feel everything that cock could give, so he focused on sucking for now. He shouldn't rush it. Who knows what his sister let’s him, or forbids him, if she wake up. No he can not let that happen. He need to worship it now, while he can.

While he never ever even thought about doing something like this to someone, let alone his sister, he slowly started to get it. Deepthroating was an art in his eye’s now, and he was able to take a 13-inch cock without much issue. It was a true marvel. And now he could taste the whole thing, well at least as good, as he can with his tongue's restricted movement space. Of course tasting just that made him cum from ecstasy.

He started to massage his sister's cock, to get her cum. After some unsuccessful attempt, he released the cock from his mouth, and started to lick her balls, while stroking her cock with both hands. He did not needed to make her cum that way, and wasting the first shot that landed on his head and back, while he was rising to take the remaining into his mouth, he got a shot at his face. At the end he was able to close his lips around the head at the third shot, and even after that Sarah continued to cum for almost a minute, filling up Adam’s stomach, who smiled at his job well than. Well the first part. Now he needed to prove he can serve this cock the way it was supposed to be, but before that, he leaned his face, of her cum, and drink that too.