Nighttime Naughtiness With Step-Bro

I cannot believe that i'm laying in bed with my step-brother and i can feel his cock getting hard and rubbing against my ass! i kinda forgot at first, i thought it was my husband and then i remembered i had to stay the night because of the weather. i didn't think this would happen when having to share the guest bedroom with him! but i gotta say, feeling his hard cock slip between my thighs and grind against my pussy has me so turned on, i don't think i can say no. it's not that weird if i just let him feel around a bit right? or that when i realize he's slipping inside me that i enjoy it... maybe it's not that terrible if i let him just fuck me, or that i orgasm on his cock. but oh no, i should have stopped him before he creampied me!!