Face down letting his brother touch his ass
Lying in her bed, she can understand that some things are irresistible to men. This, not because she is very wise, is that she has been experimenting for a few years to see what can work and what doesn’t. This has led her to develop a method that does not fail. He is face down while his brother touches his ass. He ends up getting horny and then he takes out his cock and starts fucking her. She doesn’t have to say anything and neither does he, which avoids awkwardness about incest and allows them to enjoy family sex, which is the best thing in the world. Otherwise, no one would do it.