Making a Sandwich Joke

A teen was about to finish his senior year and he still lived with his 5 year old brother.
He was going to bring his girlfriend over for a good time.
He sleeps on a bunk bed with his little bro.
He notice's his little bro is a sleep on the bottom bunk.
He tells his girl friend whenever you want me to change position say lettuce whenever you want me to go faster say tomato.
She agrees

So they start

Lettuce,tomato lettuce, tomato

Ten the little bro. Wakes up and says "Stop making sandwiches your getting mayonaise all over my face"

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