Trapped in the Cellar with Stepmom

You and your stepmom have some stepfamily over for a big holiday dinner. Your stepmom asks you to go get another bottle from down in the cellar. You don't mind being helpful, and you know that small bricked room creeps your stepmom out. But the door gets stuck and you can't get out. It's pretty useless pounding on the solid wood door, so you just chill and wait for someone to come find you. It's not long before your stepmom is at the door, but she is quick to assume you've gotten into the bottles before you can tell her not to close the door. Now, you are both trapped in the cellar. You know with the house full of stepfamily, eventually someone will come looking for the two of you, but your stepmom has some severe claustrophobia, and is in a state of panic. You try to take her mind off being trapped by talking about other things, and suggesting playing games. When you half-jokingly suggest a game of 'spin the bottle', your stepmom doesn't seem to really know what that is and actually thinks it's a sweet idea. The physical contact seems to distract her and calm her down, but after a while you can't help kissing her long and deep. At this point she realizes this might not be a game meant for stepsons to play with their stepmoms, but you're both enjoying it too much to care. You tell her there are progressive levels to the game. And why not make up new rules, when the rules and mores of outside society don't seem to apply within these walls.