My girlfriend had been keeping me waiting, and with my insatiable sex drive, I just desperately wanted to fuck. So, without even looking at her face, I thrust my erect cock into the defenseless ass sticking out at me and pounded away with raw piston fucking, cumming deep inside her pussy. Just as I was thinking about how good it felt, I realized I had fucked her little sister's pussy, and I thought I was absolutely doomed! But it seems like I might have lit a fire under her...