She gives her brother-in-law mouth-to-mouth and ends up fucking him.

We don't know what could have happened to the boy, but we do see that he almost drowned, damn it... Except that his sister-in-law was there to give him mouth-to-mouth and then enjoy a good fuck. Once safe and sound, his brother-in-law thanks her with a hard fuck. What a horny girl she is, uuf!