If Only For One Night

Prompt from Tumblr. Could u try where Regina goes drinking with Robin, they go back to Regina's and end up having sex. 18 y/o Henry hears Regina moaning so he goes to see her - Regina's on top so she can see the door, Robin can't, and so BC she's drunk she takes Robin home and watches Henry while KNOWING Henry's watching her from the door? Please! Feat. OQ