Brat wakes him up in the nicest way. It is filed under taboo incest, and runs about 5000 words. 4.5 out of 5 from 1633 readers. Part 4 of Stacy.

MindFiend also wrote Mournful Polarity.

Others under taboo incest Older Sister's Embrace, My Lingerie-Loving Sister Moves In and 2 Moms, 2 Sons... Ch. 5, and 9 more.

Or keep going.