Frisk's "back pocket"

Frisk goes on a walk and finds Venus but he didn't have any pockets so he put Venus in the back of his pants as Venus was pressed by frisk's asscheeks. Frisk gets home and forgets about Venus as he sits down and watches some movies making Venus slide into the middle of his crack as frisk gets gassy and grind his ass into Venus unknowingly. After a bit of this continuing he changes pants and underwear and then Venus is laying in his bare crack by the end.