Help!

Can you help me find story. Hermione and Snape romance. Draco gets involved later. Snape kinda Dom's Hermione, I know at the end they have a kid and their play room is in the attic. Draco comes back from a trip and Snap tells him he was missed while all three are in bed. I know during the beginning Snape make Hermione touch herself in class, while sitting near Draco.