Wash peaches and cut into chunks and place in blender. Puree. 

Combine pureed peaches and gallon of lemonade in a bowl. Mix. 

Pour peach lemonade mixture in a 9x13 pan and cover. 

Place 9x13 inch pan with mixture in the freezer for at least 8-12 hours. 

After peach lemonade has had time to freeze, take out of freezer and let set on counter for 5-10 minutes to soften slightly (makes it easier to scoop). 

Scoop slush evenly amongst 8 glasses and pour desired amount of tequila in. 

Garnish with sliced lemons and peaches. 

Cheers!