Little Johhny is walking around and peeks in his parent’s room, catching them having s*x so he asks,
“What are you guys doing?” and they reply
“Nothing, nothing! we’re just uh, making a cake” and they send him away.
So he continues walking around and he hears some strange noises coming from his brother’s room so he walks in and catches his brother and his brother’s girlfriend having s*x and then asks him
“What are you guys doing?” and his brother yells
“Get out! were making a cake!”
So Johnny leaves and goes to his room.
The next day the whole family is at the dinner table and Little Johnny turns to his sister and says
“So, you and your boyfriend were making a cake last night huh!” and she replies
“OMG! Howd you know!?!?” and Johnny replies
“Because I licked the icing off the couch”